78938896465 has 64 divisors (see below), whose sum is σ = 115897485312. Its totient is φ = 50829004800.

The previous prime is 78938896397. The next prime is 78938896471. The reversal of 78938896465 is 56469883987.

It is not a de Polignac number, because 78938896465 - 2¹⁵ = 78938863697 is a prime.

It is a super-2 number, since 2×78938896465² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 2488887 + ... + 2520403.

It is an arithmetic number, because the mean of its divisors is an integer number (1810898208).

Almost surely, 2^78938896465 is an apocalyptic number.

It is an amenable number.

78938896465 is a deficient number, since it is larger than the sum of its proper divisors (36958588847).

78938896465 is a wasteful number, since it uses less digits than its factorization.

78938896465 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31690.

The product of its digits is 627056640, while the sum is 73.

The spelling of 78938896465 in words is "seventy-eight billion, nine hundred thirty-eight million, eight hundred ninety-six thousand, four hundred sixty-five".