78330388 has 24 divisors (see below), whose sum is σ = 147369600. Its totient is φ = 36312768.

The previous prime is 78330361. The next prime is 78330403. The reversal of 78330388 is 88303387.

It is a super-2 number, since 2×78330388² = 12271299368461088, 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 78330388.

It is a congruent number.

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, 7393 + ... + 14536.

It is an arithmetic number, because the mean of its divisors is an integer number (6140400).

Almost surely, 2^78330388 is an apocalyptic number.

It is an amenable number.

78330388 is a deficient number, since it is larger than the sum of its proper divisors (69039212).

78330388 is a wasteful number, since it uses less digits than its factorization.

78330388 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21999 (or 21997 counting only the distinct ones).

The product of its (nonzero) digits is 96768, while the sum is 40.

The square root of 78330388 is about 8850.4456384975. The cubic root of 78330388 is about 427.8682813003.

The spelling of 78330388 in words is "seventy-eight million, three hundred thirty thousand, three hundred eighty-eight".