73711391978 has 96 divisors (see below), whose sum is σ = 141065971200. Its totient is φ = 28673326080.

The previous prime is 73711391977. The next prime is 73711391981. The reversal of 73711391978 is 87919311737.

It is not an unprimeable number, because it can be changed into a prime (73711391977) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 15852998 + ... + 15857646.

It is an arithmetic number, because the mean of its divisors is an integer number (1469437200).

Almost surely, 2^73711391978 is an apocalyptic number.

73711391978 is a deficient number, since it is larger than the sum of its proper divisors (67354579222).

73711391978 is a wasteful number, since it uses less digits than its factorization.

73711391978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5020 (or 5013 counting only the distinct ones).

The product of its digits is 2000376, while the sum is 56.

The spelling of 73711391978 in words is "seventy-three billion, seven hundred eleven million, three hundred ninety-one thousand, nine hundred seventy-eight".