77772872 has 8 divisors (see below), whose sum is σ = 145824150. Its totient is φ = 38886432.

The previous prime is 77772857. The next prime is 77772881. The reversal of 77772872 is 27827777.

It can be written as a sum of positive squares in only one way, i.e., 59505796 + 18267076 = 7714^2 + 4274^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4860797 + ... + 4860812.

Almost surely, 2^77772872 is an apocalyptic number.

It is an amenable number.

77772872 is a deficient number, since it is larger than the sum of its proper divisors (68051278).

77772872 is a wasteful number, since it uses less digits than its factorization.

77772872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9721615 (or 9721611 counting only the distinct ones).

The product of its digits is 537824, while the sum is 47.

The square root of 77772872 is about 8818.8929010392. The cubic root of 77772872 is about 426.8507468498.

The spelling of 77772872 in words is "seventy-seven million, seven hundred seventy-two thousand, eight hundred seventy-two".