78577513 has 4 divisors (see below), whose sum is σ = 89802880. Its totient is φ = 67352148.

The previous prime is 78577487. The next prime is 78577523. The reversal of 78577513 is 31577587.

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 a cyclic number.

It is not a de Polignac number, because 78577513 - 2⁵ = 78577481 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 78577513.

It is not an unprimeable number, because it can be changed into a prime (78577523) 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, 5612673 + ... + 5612686.

It is an arithmetic number, because the mean of its divisors is an integer number (22450720).

Almost surely, 2^78577513 is an apocalyptic number.

It is an amenable number.

78577513 is a deficient number, since it is larger than the sum of its proper divisors (11225367).

78577513 is a wasteful number, since it uses less digits than its factorization.

78577513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11225366.

The product of its digits is 205800, while the sum is 43.

The square root of 78577513 is about 8864.3958056937. The cubic root of 78577513 is about 428.3177703151.

The spelling of 78577513 in words is "seventy-eight million, five hundred seventy-seven thousand, five hundred thirteen".