78138008 has 16 divisors (see below), whose sum is σ = 157778880. Its totient is φ = 36063648.

The previous prime is 78137993. The next prime is 78138019. The reversal of 78138008 is 80083187.

It is a super-2 number, since 2×78138008² = 12211096588416128, which contains 22 as substring.

It is a Smith number, since the sum of its digits (35) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 375560 + ... + 375767.

It is an arithmetic number, because the mean of its divisors is an integer number (9861180).

Almost surely, 2^78138008 is an apocalyptic number.

It is an amenable number.

78138008 is an abundant number, since it is smaller than the sum of its proper divisors (79640872).

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

78138008 is a wasteful number, since it uses less digits than its factorization.

78138008 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 751346 (or 751342 counting only the distinct ones).

The product of its (nonzero) digits is 10752, while the sum is 35.

The square root of 78138008 is about 8839.5705778052. The cubic root of 78138008 is about 427.5177116107.

The spelling of 78138008 in words is "seventy-eight million, one hundred thirty-eight thousand, eight".