77320831 has 8 divisors (see below), whose sum is σ = 88492160. Its totient is φ = 66180888.

The previous prime is 77320819. The next prime is 77320849. The reversal of 77320831 is 13802377.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-77320831 is a prime.

It is a super-2 number, since 2×77320831² = 11957021813061122, which contains 22 as substring.

It is a pancake number, because a pancake can be divided into 77320831 parts by 12435 straight cuts.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 77320793 and 77320802.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77320531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2301 + ... + 12646.

It is an arithmetic number, because the mean of its divisors is an integer number (11061520).

Almost surely, 2^77320831 is an apocalyptic number.

77320831 is a deficient number, since it is larger than the sum of its proper divisors (11171329).

77320831 is a wasteful number, since it uses less digits than its factorization.

77320831 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15693.

The product of its (nonzero) digits is 7056, while the sum is 31.

The square root of 77320831 is about 8793.2264271995. The cubic root of 77320831 is about 426.0221413547.

The spelling of 77320831 in words is "seventy-seven million, three hundred twenty thousand, eight hundred thirty-one".