78904513 has 4 divisors (see below), whose sum is σ = 82335168. Its totient is φ = 75473860.

The previous prime is 78904481. The next prime is 78904523. The reversal of 78904513 is 31540987.

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 78904513 - 2⁵ = 78904481 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78904523) 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, 1715293 + ... + 1715338.

It is an arithmetic number, because the mean of its divisors is an integer number (20583792).

Almost surely, 2^78904513 is an apocalyptic number.

It is an amenable number.

78904513 is a deficient number, since it is larger than the sum of its proper divisors (3430655).

78904513 is a wasteful number, since it uses less digits than its factorization.

78904513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3430654.

The product of its (nonzero) digits is 30240, while the sum is 37.

The square root of 78904513 is about 8882.8212297670. The cubic root of 78904513 is about 428.9110955861.

It can be divided in two parts, 7890 and 4513, that added together give a triangular number (12403 = T₁₅₇).

The spelling of 78904513 in words is "seventy-eight million, nine hundred four thousand, five hundred thirteen".