77722872 has 16 divisors (see below), whose sum is σ = 194307240. Its totient is φ = 25907616.

The previous prime is 77722867. The next prime is 77722877. The reversal of 77722872 is 27822777.

It is an interprime number because it is at equal distance from previous prime (77722867) and next prime (77722877).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77722877) 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, 1619203 + ... + 1619250.

Almost surely, 2^77722872 is an apocalyptic number.

It is an amenable number.

77722872 is an abundant number, since it is smaller than the sum of its proper divisors (116584368).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

77722872 is a wasteful number, since it uses less digits than its factorization.

77722872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3238462 (or 3238458 counting only the distinct ones).

The product of its digits is 153664, while the sum is 42.

The square root of 77722872 is about 8816.0576223162. The cubic root of 77722872 is about 426.7592534532.

The spelling of 77722872 in words is "seventy-seven million, seven hundred twenty-two thousand, eight hundred seventy-two".