625376978 has 6 divisors (see below), whose sum is σ = 938118519. Its totient is φ = 312670806.

The previous prime is 625376959. The next prime is 625376987. The reversal of 625376978 is 879673526.

It can be written as a sum of positive squares in only one way, i.e., 312688489 + 312688489 = 17683^2 + 17683^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=17683.

It is a super-2 number, since 2×625376978² = 782192729224824968, which contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 26525 + ... + 44207.

Almost surely, 2^625376978 is an apocalyptic number.

625376978 is a deficient number, since it is larger than the sum of its proper divisors (312741541).

625376978 is an frugal number, since it uses more digits than its factorization.

625376978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35368 (or 17685 counting only the distinct ones).

The product of its digits is 3810240, while the sum is 53.

The square root of 625376978 is about 25007.5384234434. The cubic root of 625376978 is about 855.1598383387.

The spelling of 625376978 in words is "six hundred twenty-five million, three hundred seventy-six thousand, nine hundred seventy-eight".