78138846 has 24 divisors (see below), whose sum is σ = 169598520. Its totient is φ = 26000496.

The previous prime is 78138779. The next prime is 78138871. The reversal of 78138846 is 64883187.

It is a super-2 number, since 2×78138846² = 12211358508423432, which contains 22 as substring.

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, 7636 + ... + 14648.

It is an arithmetic number, because the mean of its divisors is an integer number (7066605).

Almost surely, 2^78138846 is an apocalyptic number.

78138846 is an abundant number, since it is smaller than the sum of its proper divisors (91459674).

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

78138846 is a wasteful number, since it uses less digits than its factorization.

78138846 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7640 (or 7637 counting only the distinct ones).

The product of its digits is 258048, while the sum is 45.

The square root of 78138846 is about 8839.6179781708. The cubic root of 78138846 is about 427.5192399261.

The spelling of 78138846 in words is "seventy-eight million, one hundred thirty-eight thousand, eight hundred forty-six".