77561152 has 28 divisors (see below), whose sum is σ = 160605216. Its totient is φ = 37093760.

The previous prime is 77561147. The next prime is 77561153. The reversal of 77561152 is 25116577.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77561153) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24874 + ... + 27817.

Almost surely, 2^77561152 is an apocalyptic number.

It is an amenable number.

77561152 is an abundant number, since it is smaller than the sum of its proper divisors (83044064).

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

77561152 is a wasteful number, since it uses less digits than its factorization.

77561152 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52726 (or 52716 counting only the distinct ones).

The product of its digits is 14700, while the sum is 34.

The square root of 77561152 is about 8806.8809461693. The cubic root of 77561152 is about 426.4630582340.

The spelling of 77561152 in words is "seventy-seven million, five hundred sixty-one thousand, one hundred fifty-two".