78981562478 has 80 divisors (see below), whose sum is σ = 153646098816. Its totient is φ = 30236794560.

The previous prime is 78981562423. The next prime is 78981562481. The reversal of 78981562478 is 87426518987.

It is a super-2 number, since 2×78981562478² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 1914800 + ... + 1955612.

Almost surely, 2^78981562478 is an apocalyptic number.

78981562478 is a deficient number, since it is larger than the sum of its proper divisors (74664536338).

78981562478 is a wasteful number, since it uses less digits than its factorization.

78981562478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40887 (or 40866 counting only the distinct ones).

The product of its digits is 54190080, while the sum is 65.

The spelling of 78981562478 in words is "seventy-eight billion, nine hundred eighty-one million, five hundred sixty-two thousand, four hundred seventy-eight".