78228315 has 48 divisors (see below), whose sum is σ = 152896800. Its totient is φ = 37920960.

The previous prime is 78228239. The next prime is 78228331. The reversal of 78228315 is 51382287.

It is not a de Polignac number, because 78228315 - 2¹⁸ = 77966171 is a prime.

It is a super-2 number, since 2×78228315² = 12239338535478450, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 78228315.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 13941 + ... + 18729.

It is an arithmetic number, because the mean of its divisors is an integer number (3185350).

Almost surely, 2^78228315 is an apocalyptic number.

78228315 is a deficient number, since it is larger than the sum of its proper divisors (74668485).

78228315 is a wasteful number, since it uses less digits than its factorization.

78228315 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4825 (or 4808 counting only the distinct ones).

The product of its digits is 26880, while the sum is 36.

The square root of 78228315 is about 8844.6772128778. The cubic root of 78228315 is about 427.6823475713.

The spelling of 78228315 in words is "seventy-eight million, two hundred twenty-eight thousand, three hundred fifteen".