78730794521 has 8 divisors (see below), whose sum is σ = 80655324288. Its totient is φ = 76806468000.

The previous prime is 78730794511. The next prime is 78730794533. The reversal of 78730794521 is 12549703787.

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 78730794521 - 2¹⁰ = 78730793497 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78730794511) 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, 991316 + ... + 1067786.

It is an arithmetic number, because the mean of its divisors is an integer number (10081915536).

Almost surely, 2^78730794521 is an apocalyptic number.

It is an amenable number.

78730794521 is a deficient number, since it is larger than the sum of its proper divisors (1924529767).

78730794521 is a wasteful number, since it uses less digits than its factorization.

78730794521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 101623.

The product of its (nonzero) digits is 2963520, while the sum is 53.

The spelling of 78730794521 in words is "seventy-eight billion, seven hundred thirty million, seven hundred ninety-four thousand, five hundred twenty-one".