78639475258 has 32 divisors (see below), whose sum is σ = 122935982400. Its totient is φ = 37696651776.

The previous prime is 78639475241. The next prime is 78639475331. The reversal of 78639475258 is 85257493687.

It is a self number, because there is not a number n which added to its sum of digits gives 78639475258.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3403288 + ... + 3426316.

It is an arithmetic number, because the mean of its divisors is an integer number (3841749450).

Almost surely, 2^78639475258 is an apocalyptic number.

78639475258 is a deficient number, since it is larger than the sum of its proper divisors (44296507142).

78639475258 is a wasteful number, since it uses less digits than its factorization.

78639475258 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23806.

The product of its digits is 101606400, while the sum is 64.

The spelling of 78639475258 in words is "seventy-eight billion, six hundred thirty-nine million, four hundred seventy-five thousand, two hundred fifty-eight".