77672805 has 32 divisors (see below), whose sum is σ = 145876224. Its totient is φ = 34546176.

The previous prime is 77672789. The next prime is 77672807. The reversal of 77672805 is 50827677.

It is not a de Polignac number, because 77672805 - 2⁴ = 77672789 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77672807) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6112 + ... + 13881.

It is an arithmetic number, because the mean of its divisors is an integer number (4558632).

Almost surely, 2^77672805 is an apocalyptic number.

It is an amenable number.

77672805 is a deficient number, since it is larger than the sum of its proper divisors (68203419).

77672805 is a wasteful number, since it uses less digits than its factorization.

77672805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20045.

The product of its (nonzero) digits is 164640, while the sum is 42.

The square root of 77672805 is about 8813.2176303550. The cubic root of 77672805 is about 426.6675981289.

The spelling of 77672805 in words is "seventy-seven million, six hundred seventy-two thousand, eight hundred five".