77940613 has 4 divisors (see below), whose sum is σ = 78456928. Its totient is φ = 77424300.

The previous prime is 77940607. The next prime is 77940659. The reversal of 77940613 is 31604977.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 77940613 - 2⁹ = 77940101 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77940673) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 257931 + ... + 258232.

It is an arithmetic number, because the mean of its divisors is an integer number (19614232).

Almost surely, 2^77940613 is an apocalyptic number.

It is an amenable number.

77940613 is a deficient number, since it is larger than the sum of its proper divisors (516315).

77940613 is a wasteful number, since it uses less digits than its factorization.

77940613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 516314.

The product of its (nonzero) digits is 31752, while the sum is 37.

The square root of 77940613 is about 8828.3980993156. The cubic root of 77940613 is about 427.1574045778.

The spelling of 77940613 in words is "seventy-seven million, nine hundred forty thousand, six hundred thirteen".