78158838 has 24 divisors (see below), whose sum is σ = 159741432. Its totient is φ = 25494304.

The previous prime is 78158827. The next prime is 78158849. The reversal of 78158838 is 83885187.

It is an interprime number because it is at equal distance from previous prime (78158827) and next prime (78158849).

It is a super-2 number, since 2×78158838² = 12217607915020488, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10306 + ... + 16202.

It is an arithmetic number, because the mean of its divisors is an integer number (6655893).

Almost surely, 2^78158838 is an apocalyptic number.

78158838 is an abundant number, since it is smaller than the sum of its proper divisors (81582594).

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

78158838 is a wasteful number, since it uses less digits than its factorization.

78158838 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5996 (or 5949 counting only the distinct ones).

The product of its digits is 430080, while the sum is 48.

The square root of 78158838 is about 8840.7487239487. The cubic root of 78158838 is about 427.5556974043. Note that the first 3 decimals are identical.

It can be divided in two parts, 7815 and 8838, that added together give a triangular number (16653 = T₁₈₂).

The spelling of 78158838 in words is "seventy-eight million, one hundred fifty-eight thousand, eight hundred thirty-eight".