73978539512 has 16 divisors (see below), whose sum is σ = 139367157000. Its totient is φ = 36813964320.

The previous prime is 73978539499. The next prime is 73978539529. The reversal of 73978539512 is 21593587937.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21911387 + ... + 21914762.

Almost surely, 2^73978539512 is an apocalyptic number.

It is an amenable number.

73978539512 is a deficient number, since it is larger than the sum of its proper divisors (65388617488).

73978539512 is a wasteful number, since it uses less digits than its factorization.

73978539512 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43826366 (or 43826362 counting only the distinct ones).

The product of its digits is 14288400, while the sum is 59.

The spelling of 73978539512 in words is "seventy-three billion, nine hundred seventy-eight million, five hundred thirty-nine thousand, five hundred twelve".