77568497 has 4 divisors (see below), whose sum is σ = 77614500. Its totient is φ = 77522496.

The previous prime is 77568493. The next prime is 77568503. The reversal of 77568497 is 79486577.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1547536 + 76020961 = 1244^2 + 8719^2 .

It is a cyclic number.

It is not a de Polignac number, because 77568497 - 2² = 77568493 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (77568493) 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, 20372 + ... + 23877.

It is an arithmetic number, because the mean of its divisors is an integer number (19403625).

Almost surely, 2^77568497 is an apocalyptic number.

It is an amenable number.

77568497 is a deficient number, since it is larger than the sum of its proper divisors (46003).

77568497 is a wasteful number, since it uses less digits than its factorization.

77568497 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46002.

The product of its digits is 2963520, while the sum is 53.

The square root of 77568497 is about 8807.2979397770. The cubic root of 77568497 is about 426.4765197509.

The spelling of 77568497 in words is "seventy-seven million, five hundred sixty-eight thousand, four hundred ninety-seven".