77310921 has 8 divisors (see below), whose sum is σ = 103177984. Its totient is φ = 51492240.

The previous prime is 77310913. The next prime is 77310923. The reversal of 77310921 is 12901377.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 77310921 - 2³ = 77310913 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (77310923) 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, 8185 + ... + 14886.

It is an arithmetic number, because the mean of its divisors is an integer number (12897248).

Almost surely, 2^77310921 is an apocalyptic number.

It is an amenable number.

77310921 is a deficient number, since it is larger than the sum of its proper divisors (25867063).

77310921 is a wasteful number, since it uses less digits than its factorization.

77310921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24191.

The product of its (nonzero) digits is 2646, while the sum is 30.

The square root of 77310921 is about 8792.6629072199. The cubic root of 77310921 is about 426.0039398785.

The spelling of 77310921 in words is "seventy-seven million, three hundred ten thousand, nine hundred twenty-one".