76781990 has 16 divisors (see below), whose sum is σ = 139125600. Its totient is φ = 30508800.

The previous prime is 76781977. The next prime is 76782007. The reversal of 76781990 is 9918767.

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, 23915 + ... + 26934.

It is an arithmetic number, because the mean of its divisors is an integer number (8695350).

Almost surely, 2^76781990 is an apocalyptic number.

76781990 is a deficient number, since it is larger than the sum of its proper divisors (62343610).

76781990 is a wasteful number, since it uses less digits than its factorization.

76781990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51007.

The product of its (nonzero) digits is 190512, while the sum is 47.

The square root of 76781990 is about 8762.5333094945. The cubic root of 76781990 is about 425.0301985462.

The spelling of 76781990 in words is "seventy-six million, seven hundred eighty-one thousand, nine hundred ninety".