78091258 has 16 divisors (see below), whose sum is σ = 138487680. Its totient is φ = 32313456.

The previous prime is 78091241. The next prime is 78091259. The reversal of 78091258 is 85219087.

It is a self number, because there is not a number n which added to its sum of digits gives 78091258.

It is not an unprimeable number, because it can be changed into a prime (78091259) 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, 95766 + ... + 96577.

It is an arithmetic number, because the mean of its divisors is an integer number (8655480).

Almost surely, 2^78091258 is an apocalyptic number.

78091258 is a deficient number, since it is larger than the sum of its proper divisors (60396422).

78091258 is a wasteful number, since it uses less digits than its factorization.

78091258 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 192381.

The product of its (nonzero) digits is 40320, while the sum is 40.

The square root of 78091258 is about 8836.9258229319. The cubic root of 78091258 is about 427.4324332644.

The spelling of 78091258 in words is "seventy-eight million, ninety-one thousand, two hundred fifty-eight".