78217589602 has 4 divisors (see below), whose sum is σ = 117326384406. Its totient is φ = 39108794800.

The previous prime is 78217589557. The next prime is 78217589651. The reversal of 78217589602 is 20698571287.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 65066316561 + 13151273041 = 255081^2 + 114679^2 .

It is a super-2 number, since 2×78217589602² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19554397399 + ... + 19554397402.

Almost surely, 2^78217589602 is an apocalyptic number.

78217589602 is a deficient number, since it is larger than the sum of its proper divisors (39108794804).

78217589602 is a wasteful number, since it uses less digits than its factorization.

78217589602 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39108794803.

The product of its (nonzero) digits is 3386880, while the sum is 55.

The spelling of 78217589602 in words is "seventy-eight billion, two hundred seventeen million, five hundred eighty-nine thousand, six hundred two".