77268639 has 32 divisors (see below), whose sum is σ = 122214400. Its totient is φ = 43394400.

The previous prime is 77268637. The next prime is 77268679. The reversal of 77268639 is 93686277.

It is not a de Polignac number, because 77268639 - 2¹ = 77268637 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77268637) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 62154 + ... + 63384.

It is an arithmetic number, because the mean of its divisors is an integer number (3819200).

Almost surely, 2^77268639 is an apocalyptic number.

77268639 is a deficient number, since it is larger than the sum of its proper divisors (44945761).

77268639 is a wasteful number, since it uses less digits than its factorization.

77268639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1316 (or 1302 counting only the distinct ones).

The product of its digits is 762048, while the sum is 48.

The square root of 77268639 is about 8790.2581873344. The cubic root of 77268639 is about 425.9262639907.

The spelling of 77268639 in words is "seventy-seven million, two hundred sixty-eight thousand, six hundred thirty-nine".