77716331 has 8 divisors (see below), whose sum is σ = 96893184. Its totient is φ = 60558120.

The previous prime is 77716319. The next prime is 77716337. The reversal of 77716331 is 13361777.

77716331 = 1869² + 1870² + ... + 1890².

It is a happy number.

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

It is not a de Polignac number, because 77716331 - 2¹⁸ = 77454187 is a prime.

It is a super-2 number, since 2×77716331² = 12079656208203122, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 77716291 and 77716300.

It is not an unprimeable number, because it can be changed into a prime (77716337) 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, 504575 + ... + 504728.

It is an arithmetic number, because the mean of its divisors is an integer number (12111648).

Almost surely, 2^77716331 is an apocalyptic number.

77716331 is a deficient number, since it is larger than the sum of its proper divisors (19176853).

77716331 is a wasteful number, since it uses less digits than its factorization.

77716331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1009321.

The product of its digits is 18522, while the sum is 35.

The square root of 77716331 is about 8815.6866437051. The cubic root of 77716331 is about 426.7472813849.

The spelling of 77716331 in words is "seventy-seven million, seven hundred sixteen thousand, three hundred thirty-one".