77672239 has 4 divisors (see below), whose sum is σ = 77694424. Its totient is φ = 77650056.

The previous prime is 77672207. The next prime is 77672281. The reversal of 77672239 is 93227677.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 77672239 - 2⁵ = 77672207 is a prime.

It is a super-2 number, since 2×77672239² = 12065953422546242, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 77672195 and 77672204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77642239) 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, 4557 + ... + 13270.

It is an arithmetic number, because the mean of its divisors is an integer number (19423606).

Almost surely, 2^77672239 is an apocalyptic number.

77672239 is a deficient number, since it is larger than the sum of its proper divisors (22185).

77672239 is a wasteful number, since it uses less digits than its factorization.

77672239 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22184.

The product of its digits is 222264, while the sum is 43.

The square root of 77672239 is about 8813.1855194362. The cubic root of 77672239 is about 426.6665617540. Note that the first 3 decimals are identical.

The spelling of 77672239 in words is "seventy-seven million, six hundred seventy-two thousand, two hundred thirty-nine".