51870000 has 400 divisors, whose sum is σ = 216930560. Its totient is φ = 10368000.

The previous prime is 51869977. The next prime is 51870059. The reversal of 51870000 is 7815.

It is a happy number.

51870000 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (400).

It is a Harshad number since it is a multiple of its sum of digits (21).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 2729991 + ... + 2730009.

Almost surely, 2^51870000 is an apocalyptic number.

51870000 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51870000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (108465280).

51870000 is an abundant number, since it is smaller than the sum of its proper divisors (165060560).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

51870000 is a wasteful number, since it uses less digits than its factorization.

51870000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70 (or 49 counting only the distinct ones).

The product of its (nonzero) digits is 280, while the sum is 21.

The square root of 51870000 is about 7202.0830320123. The cubic root of 51870000 is about 372.9398135226.

Adding to 51870000 its reverse (7815), we get a palindrome (51877815).

The spelling of 51870000 in words is "fifty-one million, eight hundred seventy thousand".