78404747731 has 16 divisors (see below), whose sum is σ = 79723526400. Its totient is φ = 77098291200.

The previous prime is 78404747723. The next prime is 78404747783. The reversal of 78404747731 is 13774740487.

It is a cyclic number.

It is not a de Polignac number, because 78404747731 - 2³ = 78404747723 is a prime.

It is a super-2 number, since 2×78404747731² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78404747231) 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, 10108951 + ... + 10116703.

It is an arithmetic number, because the mean of its divisors is an integer number (4982720400).

Almost surely, 2^78404747731 is an apocalyptic number.

78404747731 is a deficient number, since it is larger than the sum of its proper divisors (1318778669).

78404747731 is a wasteful number, since it uses less digits than its factorization.

78404747731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8526.

The product of its (nonzero) digits is 3687936, while the sum is 52.

The spelling of 78404747731 in words is "seventy-eight billion, four hundred four million, seven hundred forty-seven thousand, seven hundred thirty-one".