77997532 has 6 divisors (see below), whose sum is σ = 136495688. Its totient is φ = 38998764.

The previous prime is 77997529. The next prime is 77997541. The reversal of 77997532 is 23579977.

It is a super-2 number, since 2×77997532² = 12167229996182048, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9749688 + ... + 9749695.

Almost surely, 2^77997532 is an apocalyptic number.

It is an amenable number.

77997532 is a deficient number, since it is larger than the sum of its proper divisors (58498156).

77997532 is a wasteful number, since it uses less digits than its factorization.

77997532 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19499387 (or 19499385 counting only the distinct ones).

The product of its digits is 833490, while the sum is 49.

The square root of 77997532 is about 8831.6211422366. The cubic root of 77997532 is about 427.2613617455.

The spelling of 77997532 in words is "seventy-seven million, nine hundred ninety-seven thousand, five hundred thirty-two".