78947136 has 140 divisors (see below), whose sum is σ = 237942628. Its totient is φ = 25878528.

The previous prime is 78947119. The next prime is 78947153. The reversal of 78947136 is 63174987.

It is an interprime number because it is at equal distance from previous prime (78947119) and next prime (78947153).

It can be written as a sum of positive squares in 2 ways, for example, as 29160000 + 49787136 = 5400^2 + 7056^2 .

It is a junction number, because it is equal to n+sod(n) for n = 78947091 and 78947100.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 502770 + ... + 502926.

Almost surely, 2^78947136 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 78947136, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (118971314).

78947136 is an abundant number, since it is smaller than the sum of its proper divisors (158995492).

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

78947136 is a wasteful number, since it uses less digits than its factorization.

78947136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 278 (or 259 counting only the distinct ones).

The product of its digits is 254016, while the sum is 45.

The square root of 78947136 is about 8885.2200873135. The cubic root of 78947136 is about 428.9883120685.

The spelling of 78947136 in words is "seventy-eight million, nine hundred forty-seven thousand, one hundred thirty-six".