77949513 has 8 divisors (see below), whose sum is σ = 115480800. Its totient is φ = 51966324.

The previous prime is 77949511. The next prime is 77949523. The reversal of 77949513 is 31594977.

It is not a de Polignac number, because 77949513 - 2¹ = 77949511 is a prime.

It is a super-2 number, since 2×77949513² = 12152253153874338, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (77949511) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1443483 + ... + 1443536.

It is an arithmetic number, because the mean of its divisors is an integer number (14435100).

Almost surely, 2^77949513 is an apocalyptic number.

It is an amenable number.

77949513 is a deficient number, since it is larger than the sum of its proper divisors (37531287).

77949513 is a wasteful number, since it uses less digits than its factorization.

77949513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2887028 (or 2887022 counting only the distinct ones).

The product of its digits is 238140, while the sum is 45.

The square root of 77949513 is about 8828.9021401304. The cubic root of 77949513 is about 427.1736629231.

The spelling of 77949513 in words is "seventy-seven million, nine hundred forty-nine thousand, five hundred thirteen".