78258136 has 32 divisors (see below), whose sum is σ = 165242880. Its totient is φ = 34423200.

The previous prime is 78258113. The next prime is 78258139. The reversal of 78258136 is 63185287.

It is a super-2 number, since 2×78258136² = 12248671700388992, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78258139) 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, 11616 + ... + 17071.

It is an arithmetic number, because the mean of its divisors is an integer number (5163840).

Almost surely, 2^78258136 is an apocalyptic number.

It is an amenable number.

78258136 is an abundant number, since it is smaller than the sum of its proper divisors (86984744).

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

78258136 is a wasteful number, since it uses less digits than its factorization.

78258136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28735 (or 28731 counting only the distinct ones).

The product of its digits is 80640, while the sum is 40.

The square root of 78258136 is about 8846.3628684336. The cubic root of 78258136 is about 427.7366855052.

The spelling of 78258136 in words is "seventy-eight million, two hundred fifty-eight thousand, one hundred thirty-six".