78515887074 has 16 divisors (see below), whose sum is σ = 161275876608. Its totient is φ = 25464611952.

The previous prime is 78515887031. The next prime is 78515887157. The reversal of 78515887074 is 47078851587.

It is a junction number, because it is equal to n+sod(n) for n = 78515886999 and 78515887017.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 176837362 + ... + 176837805.

It is an arithmetic number, because the mean of its divisors is an integer number (10079742288).

Almost surely, 2^78515887074 is an apocalyptic number.

78515887074 is a gapful number since it is divisible by the number (74) formed by its first and last digit.

78515887074 is an abundant number, since it is smaller than the sum of its proper divisors (82759989534).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

78515887074 is a wasteful number, since it uses less digits than its factorization.

78515887074 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 353675209.

The product of its (nonzero) digits is 17561600, while the sum is 60.

The spelling of 78515887074 in words is "seventy-eight billion, five hundred fifteen million, eight hundred eighty-seven thousand, seventy-four".