77812090 has 16 divisors (see below), whose sum is σ = 140165280. Its totient is φ = 31101840.

The previous prime is 77812079. The next prime is 77812093. The reversal of 77812090 is 9021877.

It is not an unprimeable number, because it can be changed into a prime (77812093) by changing a digit.

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, 20005 + ... + 23575.

It is an arithmetic number, because the mean of its divisors is an integer number (8760330).

Almost surely, 2^77812090 is an apocalyptic number.

77812090 is a deficient number, since it is larger than the sum of its proper divisors (62353190).

77812090 is a wasteful number, since it uses less digits than its factorization.

77812090 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5757.

The product of its (nonzero) digits is 7056, while the sum is 34.

The square root of 77812090 is about 8821.1161425298. The cubic root of 77812090 is about 426.9224831726.

The spelling of 77812090 in words is "seventy-seven million, eight hundred twelve thousand, ninety".