77316820 has 24 divisors (see below), whose sum is σ = 185560704. Its totient is φ = 26508576.

The previous prime is 77316803. The next prime is 77316851. The reversal of 77316820 is 2861377.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 275992 + ... + 276271.

It is an arithmetic number, because the mean of its divisors is an integer number (7731696).

Almost surely, 2^77316820 is an apocalyptic number.

77316820 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

It is an amenable number.

77316820 is an abundant number, since it is smaller than the sum of its proper divisors (108243884).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

77316820 is a wasteful number, since it uses less digits than its factorization.

77316820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 552279 (or 552277 counting only the distinct ones).

The product of its (nonzero) digits is 14112, while the sum is 34.

The square root of 77316820 is about 8792.9983509608. The cubic root of 77316820 is about 426.0147746277.

The spelling of 77316820 in words is "seventy-seven million, three hundred sixteen thousand, eight hundred twenty".