77997543 has 16 divisors (see below), whose sum is σ = 113049216. Its totient is φ = 47547360.

The previous prime is 77997541. The next prime is 77997551. The reversal of 77997543 is 34579977.

It is not a de Polignac number, because 77997543 - 2¹ = 77997541 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77997541) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5173 + ... + 13518.

It is an arithmetic number, because the mean of its divisors is an integer number (7065576).

Almost surely, 2^77997543 is an apocalyptic number.

77997543 is a deficient number, since it is larger than the sum of its proper divisors (35051673).

77997543 is a wasteful number, since it uses less digits than its factorization.

77997543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18814.

The product of its digits is 1666980, while the sum is 51.

The square root of 77997543 is about 8831.6217649988. The cubic root of 77997543 is about 427.2613818311.

The spelling of 77997543 in words is "seventy-seven million, nine hundred ninety-seven thousand, five hundred forty-three".