77564541 has 4 divisors (see below), whose sum is σ = 103419392. Its totient is φ = 51709692.

The previous prime is 77564521. The next prime is 77564551. The reversal of 77564541 is 14546577.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 77564541 - 2⁹ = 77564029 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 77564541.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77564521) 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, 12927421 + ... + 12927426.

It is an arithmetic number, because the mean of its divisors is an integer number (25854848).

Almost surely, 2^77564541 is an apocalyptic number.

It is an amenable number.

77564541 is a deficient number, since it is larger than the sum of its proper divisors (25854851).

77564541 is a wasteful number, since it uses less digits than its factorization.

77564541 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25854850.

The product of its digits is 117600, while the sum is 39.

The square root of 77564541 is about 8807.0733504383. The cubic root of 77564541 is about 426.4692695147.

The spelling of 77564541 in words is "seventy-seven million, five hundred sixty-four thousand, five hundred forty-one".