78365797690 has 16 divisors (see below), whose sum is σ = 141072804360. Its totient is φ = 31343126080.

The previous prime is 78365797669. The next prime is 78365797693. The reversal of 78365797690 is 9679756387.

It can be written as a sum of positive squares in 4 ways, for example, as 14592881601 + 63772916089 = 120801^2 + 252533^2 .

It is a super-2 number, since 2×78365797690² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (78365797693) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 294745 + ... + 493564.

Almost surely, 2^78365797690 is an apocalyptic number.

78365797690 is a deficient number, since it is larger than the sum of its proper divisors (62707006670).

78365797690 is a wasteful number, since it uses less digits than its factorization.

78365797690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 798257.

The product of its (nonzero) digits is 120022560, while the sum is 67.

The spelling of 78365797690 in words is "seventy-eight billion, three hundred sixty-five million, seven hundred ninety-seven thousand, six hundred ninety".