77949291 has 16 divisors (see below), whose sum is σ = 119051264. Its totient is φ = 44440704.

The previous prime is 77949259. The next prime is 77949299. The reversal of 77949291 is 19294977.

It is a happy number.

It is not a de Polignac number, because 77949291 - 2⁵ = 77949259 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 77949291.

It is not an unprimeable number, because it can be changed into a prime (77949299) 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, 5715 + ... + 13731.

It is an arithmetic number, because the mean of its divisors is an integer number (7440704).

Almost surely, 2^77949291 is an apocalyptic number.

77949291 is a deficient number, since it is larger than the sum of its proper divisors (41101973).

77949291 is a wasteful number, since it uses less digits than its factorization.

77949291 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8490.

The product of its digits is 285768, while the sum is 48.

The square root of 77949291 is about 8828.8895677769. The cubic root of 77949291 is about 427.1732573929.

The spelling of 77949291 in words is "seventy-seven million, nine hundred forty-nine thousand, two hundred ninety-one".