77890573256 has 16 divisors (see below), whose sum is σ = 146297944140. Its totient is φ = 38877788160.

The previous prime is 77890573253. The next prime is 77890573301. The reversal of 77890573256 is 65237509877.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 57451296100 + 20439277156 = 239690^2 + 142966^2 .

It is a super-4 number, since 4×77890573256⁴ (a number of 45 digits) contains 4444 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 77890573195 and 77890573204.

It is not an unprimeable number, because it can be changed into a prime (77890573253) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8432405 + ... + 8441636.

Almost surely, 2^77890573256 is an apocalyptic number.

It is an amenable number.

77890573256 is a deficient number, since it is larger than the sum of its proper divisors (68407370884).

77890573256 is a wasteful number, since it uses less digits than its factorization.

77890573256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16874624 (or 16874620 counting only the distinct ones).

The product of its (nonzero) digits is 22226400, while the sum is 59.

The spelling of 77890573256 in words is "seventy-seven billion, eight hundred ninety million, five hundred seventy-three thousand, two hundred fifty-six".