78250000 has 70 divisors (see below), whose sum is σ = 190114754. Its totient is φ = 31200000.

The previous prime is 78249973. The next prime is 78250001. The reversal of 78250000 is 5287.

It can be written as a sum of positive squares in 7 ways, for example, as 67174416 + 11075584 = 8196^2 + 3328^2 .

It is a super-2 number, since 2×78250000² = 12246125000000000, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78250001) by changing a digit.

It is a polite number, since it can be written in 13 ways as a sum of consecutive naturals, for example, 249844 + ... + 250156.

Almost surely, 2^78250000 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 78250000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (95057377).

78250000 is an abundant number, since it is smaller than the sum of its proper divisors (111864754).

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

78250000 is an frugal number, since it uses more digits than its factorization.

78250000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 351 (or 320 counting only the distinct ones).

The product of its (nonzero) digits is 560, while the sum is 22.

The square root of 78250000 is about 8845.9030064771. The cubic root of 78250000 is about 427.7218619717.

Adding to 78250000 its reverse (5287), we get a palindrome (78255287).

The spelling of 78250000 in words is "seventy-eight million, two hundred fifty thousand".