77155090 has 16 divisors (see below), whose sum is σ = 139005720. Its totient is φ = 30833920.

The previous prime is 77155081. The next prime is 77155093. The reversal of 77155090 is 9055177.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 38975049 + 38180041 = 6243^2 + 6179^2 .

It is not an unprimeable number, because it can be changed into a prime (77155093) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10776 + ... + 16444.

Almost surely, 2^77155090 is an apocalyptic number.

77155090 is a deficient number, since it is larger than the sum of its proper divisors (61850630).

77155090 is a wasteful number, since it uses less digits than its factorization.

77155090 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7037.

The product of its (nonzero) digits is 11025, while the sum is 34.

The square root of 77155090 is about 8783.7970149588. The cubic root of 77155090 is about 425.7175237999.

The spelling of 77155090 in words is "seventy-seven million, one hundred fifty-five thousand, ninety".