77723972 has 12 divisors (see below), whose sum is σ = 136140396. Its totient is φ = 38826720.

The previous prime is 77723959. The next prime is 77723981. The reversal of 77723972 is 27932777.

It can be written as a sum of positive squares in 2 ways, for example, as 71503936 + 6220036 = 8456^2 + 2494^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3503 + ... + 12950.

It is an arithmetic number, because the mean of its divisors is an integer number (11345033).

Almost surely, 2^77723972 is an apocalyptic number.

It is an amenable number.

77723972 is a deficient number, since it is larger than the sum of its proper divisors (58416424).

77723972 is a wasteful number, since it uses less digits than its factorization.

77723972 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17638 (or 17636 counting only the distinct ones).

The product of its digits is 259308, while the sum is 44.

The square root of 77723972 is about 8816.1200082576. The cubic root of 77723972 is about 426.7612667300.

The spelling of 77723972 in words is "seventy-seven million, seven hundred twenty-three thousand, nine hundred seventy-two".