78345284 has 24 divisors (see below), whose sum is σ = 145474560. Its totient is φ = 36814176.

The previous prime is 78345271. The next prime is 78345347. The reversal of 78345284 is 48254387.

It is a super-2 number, since 2×78345284² = 12275967050081312, which contains 22 as substring.

It is a Smith number, since the sum of its digits (41) coincides with the sum of the digits of its prime factors.

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, 5594 + ... + 13710.

It is an arithmetic number, because the mean of its divisors is an integer number (6061440).

Almost surely, 2^78345284 is an apocalyptic number.

It is an amenable number.

78345284 is a deficient number, since it is larger than the sum of its proper divisors (67129276).

78345284 is a wasteful number, since it uses less digits than its factorization.

78345284 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8267 (or 8265 counting only the distinct ones).

The product of its digits is 215040, while the sum is 41.

The square root of 78345284 is about 8851.2871380382. The cubic root of 78345284 is about 427.8954019879.

The spelling of 78345284 in words is "seventy-eight million, three hundred forty-five thousand, two hundred eighty-four".