77949890382 has 64 divisors (see below), whose sum is σ = 195959199744. Its totient is φ = 20120797440.

The previous prime is 77949890363. The next prime is 77949890461. The reversal of 77949890382 is 28309894977.

It is a super-2 number, since 2×77949890382² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1493119 + ... + 1544442.

It is an arithmetic number, because the mean of its divisors is an integer number (3061862496).

Almost surely, 2^77949890382 is an apocalyptic number.

77949890382 is an abundant number, since it is smaller than the sum of its proper divisors (118009309362).

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

77949890382 is a wasteful number, since it uses less digits than its factorization.

77949890382 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3037633.

The product of its (nonzero) digits is 54867456, while the sum is 66.

The spelling of 77949890382 in words is "seventy-seven billion, nine hundred forty-nine million, eight hundred ninety thousand, three hundred eighty-two".