77897488 has 20 divisors (see below), whose sum is σ = 153402508. Its totient is φ = 38309760.

The previous prime is 77897453. The next prime is 77897503. The reversal of 77897488 is 88479877.

It can be written as a sum of positive squares in 2 ways, for example, as 41319184 + 36578304 = 6428^2 + 6048^2 .

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 38931 + ... + 40882.

Almost surely, 2^77897488 is an apocalyptic number.

It is an amenable number.

77897488 is a deficient number, since it is larger than the sum of its proper divisors (75505020).

77897488 is a wasteful number, since it uses less digits than its factorization.

77897488 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79882 (or 79876 counting only the distinct ones).

The product of its digits is 6322176, while the sum is 58.

The square root of 77897488 is about 8825.9553590532. The cubic root of 77897488 is about 427.0786071408.

The spelling of 77897488 in words is "seventy-seven million, eight hundred ninety-seven thousand, four hundred eighty-eight".