78628326521 has 8 divisors (see below), whose sum is σ = 79051313664. Its totient is φ = 78205457680.

The previous prime is 78628326503. The next prime is 78628326541. The reversal of 78628326521 is 12562382687.

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 78628326521 - 2⁶ = 78628326457 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 78628326521.

It is not an unprimeable number, because it can be changed into a prime (78628326541) 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, 1520330 + ... + 1571196.

It is an arithmetic number, because the mean of its divisors is an integer number (9881414208).

Almost surely, 2^78628326521 is an apocalyptic number.

It is an amenable number.

78628326521 is a deficient number, since it is larger than the sum of its proper divisors (422987143).

78628326521 is a wasteful number, since it uses less digits than its factorization.

78628326521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59151.

The product of its digits is 1935360, while the sum is 50.

The spelling of 78628326521 in words is "seventy-eight billion, six hundred twenty-eight million, three hundred twenty-six thousand, five hundred twenty-one".