78434537731 has 16 divisors (see below), whose sum is σ = 87727115520. Its totient is φ = 69508847520.

The previous prime is 78434537723. The next prime is 78434537771. The reversal of 78434537731 is 13773543487.

It is a cyclic number.

It is not a de Polignac number, because 78434537731 - 2³ = 78434537723 is a prime.

It is a super-2 number, since 2×78434537731² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (78434537771) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 77866 + ... + 403648.

It is an arithmetic number, because the mean of its divisors is an integer number (5482944720).

Almost surely, 2^78434537731 is an apocalyptic number.

78434537731 is a deficient number, since it is larger than the sum of its proper divisors (9292577789).

78434537731 is a wasteful number, since it uses less digits than its factorization.

78434537731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 326346.

The product of its digits is 5927040, while the sum is 52.

The spelling of 78434537731 in words is "seventy-eight billion, four hundred thirty-four million, five hundred thirty-seven thousand, seven hundred thirty-one".