77539013 has 8 divisors (see below), whose sum is σ = 80427000. Its totient is φ = 74692800.

The previous prime is 77539001. The next prime is 77539027. The reversal of 77539013 is 31093577.

It can be written as a sum of positive squares in 4 ways, for example, as 25020004 + 52519009 = 5002^2 + 7247^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 77539013 - 2⁴ = 77538997 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77569013) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6638 + ... + 14111.

It is an arithmetic number, because the mean of its divisors is an integer number (10053375).

Almost surely, 2^77539013 is an apocalyptic number.

It is an amenable number.

77539013 is a deficient number, since it is larger than the sum of its proper divisors (2887987).

77539013 is a wasteful number, since it uses less digits than its factorization.

77539013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20887.

The product of its (nonzero) digits is 19845, while the sum is 35.

The square root of 77539013 is about 8805.6239415501. The cubic root of 77539013 is about 426.4224779354.

The spelling of 77539013 in words is "seventy-seven million, five hundred thirty-nine thousand, thirteen".