77491080 has 80 divisors (see below), whose sum is σ = 260467020. Its totient is φ = 20663424.

The previous prime is 77491067. The next prime is 77491087. The reversal of 77491080 is 8019477.

It can be written as a sum of positive squares in 2 ways, for example, as 77475204 + 15876 = 8802^2 + 126^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (77491087) 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 19 ways as a sum of consecutive naturals, for example, 8719 + ... + 15198.

Almost surely, 2^77491080 is an apocalyptic number.

It is an amenable number.

77491080 is an abundant number, since it is smaller than the sum of its proper divisors (182975940).

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

77491080 is a wasteful number, since it uses less digits than its factorization.

77491080 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23940 (or 23927 counting only the distinct ones).

The product of its (nonzero) digits is 14112, while the sum is 36.

The square root of 77491080 is about 8802.9017942949. The cubic root of 77491080 is about 426.3345913302.

The spelling of 77491080 in words is "seventy-seven million, four hundred ninety-one thousand, eighty".