77713621 has 12 divisors (see below), whose sum is σ = 81346944. Its totient is φ = 74163600.

The previous prime is 77713609. The next prime is 77713627. The reversal of 77713621 is 12631777.

It is not a de Polignac number, because 77713621 - 2⁵ = 77713589 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 (77713627) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 368206 + ... + 368416.

It is an arithmetic number, because the mean of its divisors is an integer number (6778912).

Almost surely, 2^77713621 is an apocalyptic number.

It is an amenable number.

77713621 is a deficient number, since it is larger than the sum of its proper divisors (3633323).

77713621 is a wasteful number, since it uses less digits than its factorization.

77713621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 460 (or 351 counting only the distinct ones).

The product of its digits is 12348, while the sum is 34.

The square root of 77713621 is about 8815.5329390797. The cubic root of 77713621 is about 426.7423210436.

The spelling of 77713621 in words is "seventy-seven million, seven hundred thirteen thousand, six hundred twenty-one".