78687057407707 has 6 divisors (see below), whose sum is σ = 91533923923308. Its totient is φ = 67446049206564.

The previous prime is 78687057407681. The next prime is 78687057407723. The reversal of 78687057407707 is 70770475078687.

It is a de Polignac number, because none of the positive numbers 2^k-78687057407707 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 78687057407707.

It is not an unprimeable number, because it can be changed into a prime (78687057407107) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 802929157173 + ... + 802929157270.

It is an arithmetic number, because the mean of its divisors is an integer number (15255653987218).

Almost surely, 2^{78687057407707} is an apocalyptic number.

78687057407707 is a deficient number, since it is larger than the sum of its proper divisors (12846866515601).

78687057407707 is a wasteful number, since it uses less digits than its factorization.

78687057407707 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1605858314457 (or 1605858314450 counting only the distinct ones).

The product of its (nonzero) digits is 903544320, while the sum is 73.

The spelling of 78687057407707 in words is "seventy-eight trillion, six hundred eighty-seven billion, fifty-seven million, four hundred seven thousand, seven hundred seven".