78537474738844 has 36 divisors (see below), whose sum is σ = 151107396850872. Its totient is φ = 35690263591840.

The previous prime is 78537474738823. The next prime is 78537474738881. The reversal of 78537474738844 is 44883747473587.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 17505394 + ... + 21529369.

It is an arithmetic number, because the mean of its divisors is an integer number (4197427690302).

Almost surely, 2^{78537474738844} is an apocalyptic number.

It is an amenable number.

78537474738844 is a deficient number, since it is larger than the sum of its proper divisors (72569922112028).

78537474738844 is a wasteful number, since it uses less digits than its factorization.

78537474738844 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39038946 (or 39038933 counting only the distinct ones).

The product of its digits is 14161674240, while the sum is 79.

The spelling of 78537474738844 in words is "seventy-eight trillion, five hundred thirty-seven billion, four hundred seventy-four million, seven hundred thirty-eight thousand, eight hundred forty-four".