51040000 has 180 divisors, whose sum is σ = 143672760. Its totient is φ = 17920000.

The previous prime is 51039973. The next prime is 51040019. The reversal of 51040000 is 4015.

It is a Harshad number since it is a multiple of its sum of digits (10).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 1759986 + ... + 1760014.

It is an arithmetic number, because the mean of its divisors is an integer number (798182).

Almost surely, 2^51040000 is an apocalyptic number.

51040000 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 51040000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (71836380).

51040000 is an abundant number, since it is smaller than the sum of its proper divisors (92632760).

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

51040000 is an equidigital number, since it uses as much as digits as its factorization.

51040000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76 (or 47 counting only the distinct ones).

The product of its (nonzero) digits is 20, while the sum is 10.

The square root of 51040000 is about 7144.2284397967. The cubic root of 51040000 is about 370.9399040029.

Adding to 51040000 its reverse (4015), we get a palindrome (51044015).

The spelling of 51040000 in words is "fifty-one million, forty thousand".