78642152 has 16 divisors (see below), whose sum is σ = 153865440. Its totient is φ = 37611376.

The previous prime is 78642101. The next prime is 78642173. The reversal of 78642152 is 25124687.

It is a super-2 number, since 2×78642152² = 12369176142382208, which contains 22 as substring.

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, 213518 + ... + 213885.

It is an arithmetic number, because the mean of its divisors is an integer number (9616590).

Almost surely, 2^78642152 is an apocalyptic number.

It is an amenable number.

78642152 is a deficient number, since it is larger than the sum of its proper divisors (75223288).

78642152 is a wasteful number, since it uses less digits than its factorization.

78642152 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 427432 (or 427428 counting only the distinct ones).

The product of its digits is 26880, while the sum is 35.

The square root of 78642152 is about 8868.0410463642. The cubic root of 78642152 is about 428.4351849253.

The spelling of 78642152 in words is "seventy-eight million, six hundred forty-two thousand, one hundred fifty-two".