77370561 has 6 divisors (see below), whose sum is σ = 111757490. Its totient is φ = 51580368.

The previous prime is 77370533. The next prime is 77370563. The reversal of 77370561 is 16507377.

It can be written as a sum of positive squares in only one way, i.e., 72335025 + 5035536 = 8505^2 + 2244^2 .

It is not a de Polignac number, because 77370561 - 2⁵ = 77370529 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (77370563) 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 5 ways as a sum of consecutive naturals, for example, 4298356 + ... + 4298373.

Almost surely, 2^77370561 is an apocalyptic number.

It is an amenable number.

77370561 is a deficient number, since it is larger than the sum of its proper divisors (34386929).

77370561 is a wasteful number, since it uses less digits than its factorization.

77370561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8596735 (or 8596732 counting only the distinct ones).

The product of its (nonzero) digits is 30870, while the sum is 36.

The square root of 77370561 is about 8796.0537174349. The cubic root of 77370561 is about 426.1134558616.

The spelling of 77370561 in words is "seventy-seven million, three hundred seventy thousand, five hundred sixty-one".