78385252 has 24 divisors (see below), whose sum is σ = 150891552. Its totient is φ = 35627240.

The previous prime is 78385211. The next prime is 78385261. The reversal of 78385252 is 25258387.

It is a super-2 number, since 2×78385252² = 12288495462207008, which contains 22 as substring.

It is an alternating number because its digits alternate between odd and even.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2038 + ... + 12685.

It is an arithmetic number, because the mean of its divisors is an integer number (6287148).

Almost surely, 2^78385252 is an apocalyptic number.

It is an amenable number.

78385252 is a deficient number, since it is larger than the sum of its proper divisors (72506300).

78385252 is a wasteful number, since it uses less digits than its factorization.

78385252 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14760 (or 14736 counting only the distinct ones).

The product of its digits is 134400, while the sum is 40.

The square root of 78385252 is about 8853.5446008929. The cubic root of 78385252 is about 427.9681535101.

The spelling of 78385252 in words is "seventy-eight million, three hundred eighty-five thousand, two hundred fifty-two".