77756745 has 16 divisors (see below), whose sum is σ = 135721152. Its totient is φ = 37700160.

The previous prime is 77756737. The next prime is 77756747. The reversal of 77756745 is 54765777.

It is not a de Polignac number, because 77756745 - 2³ = 77756737 is a prime.

It is a super-2 number, since 2×77756745² = 12092222785990050, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 77756694 and 77756703.

It is not an unprimeable number, because it can be changed into a prime (77756747) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 235462 + ... + 235791.

It is an arithmetic number, because the mean of its divisors is an integer number (8482572).

Almost surely, 2^77756745 is an apocalyptic number.

It is an amenable number.

77756745 is a deficient number, since it is larger than the sum of its proper divisors (57964407).

77756745 is a wasteful number, since it uses less digits than its factorization.

77756745 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 471272.

The product of its digits is 1440600, while the sum is 48.

The square root of 77756745 is about 8817.9785098400. The cubic root of 77756745 is about 426.8212408550.

The spelling of 77756745 in words is "seventy-seven million, seven hundred fifty-six thousand, seven hundred forty-five".