77693021 has 16 divisors (see below), whose sum is σ = 91570176. Its totient is φ = 64538736.

The previous prime is 77693017. The next prime is 77693027. The reversal of 77693021 is 12039677.

It is a cyclic number.

It is not a de Polignac number, because 77693021 - 2² = 77693017 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 (77693027) 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, 34100 + ... + 36306.

It is an arithmetic number, because the mean of its divisors is an integer number (5723136).

Almost surely, 2^77693021 is an apocalyptic number.

It is an amenable number.

77693021 is a deficient number, since it is larger than the sum of its proper divisors (13877155).

77693021 is a wasteful number, since it uses less digits than its factorization.

77693021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2368.

The product of its (nonzero) digits is 15876, while the sum is 35.

The square root of 77693021 is about 8814.3644694328. The cubic root of 77693021 is about 426.7046113579.

The spelling of 77693021 in words is "seventy-seven million, six hundred ninety-three thousand, twenty-one".