76988561 has 16 divisors (see below), whose sum is σ = 84834624. Its totient is φ = 69436224.

The previous prime is 76988537. The next prime is 76988579. The reversal of 76988561 is 16588967.

It is a happy number.

It is not a de Polignac number, because 76988561 - 2¹⁸ = 76726417 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (76982561) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 136466 + ... + 137028.

It is an arithmetic number, because the mean of its divisors is an integer number (5302164).

Almost surely, 2^76988561 is an apocalyptic number.

It is an amenable number.

76988561 is a deficient number, since it is larger than the sum of its proper divisors (7846063).

76988561 is a wasteful number, since it uses less digits than its factorization.

76988561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 800.

The product of its digits is 725760, while the sum is 50.

The square root of 76988561 is about 8774.3125656658. The cubic root of 76988561 is about 425.4110182923.

The spelling of 76988561 in words is "seventy-six million, nine hundred eighty-eight thousand, five hundred sixty-one".