780625690 has 16 divisors (see below), whose sum is σ = 1513213128. Its totient is φ = 288230976.

The previous prime is 780625687. The next prime is 780625717. The reversal of 780625690 is 96526087.

It can be written as a sum of positive squares in 4 ways, for example, as 423906921 + 356718769 = 20589^2 + 18887^2 .

It is a super-2 number, since 2×780625690² = 1218752935775952200, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3002277 + ... + 3002536.

Almost surely, 2^780625690 is an apocalyptic number.

780625690 is a deficient number, since it is larger than the sum of its proper divisors (732587438).

780625690 is a wasteful number, since it uses less digits than its factorization.

780625690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6004833.

The product of its (nonzero) digits is 181440, while the sum is 43.

The square root of 780625690 is about 27939.6794899297. The cubic root of 780625690 is about 920.7624783265.

The spelling of 780625690 in words is "seven hundred eighty million, six hundred twenty-five thousand, six hundred ninety".