78217888 has 24 divisors (see below), whose sum is σ = 175990752. Its totient is φ = 33521856.

The previous prime is 78217861. The next prime is 78217897. The reversal of 78217888 is 88871287.

It is a super-2 number, since 2×78217888² = 12236076006361088, which contains 22 as substring.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors.

It is a nude number because it is divisible by every one of its digits.

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, 174370 + ... + 174817.

It is an arithmetic number, because the mean of its divisors is an integer number (7332948).

Almost surely, 2^78217888 is an apocalyptic number.

It is an amenable number.

78217888 is an abundant number, since it is smaller than the sum of its proper divisors (97772864).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

78217888 is a wasteful number, since it uses less digits than its factorization.

78217888 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 349204 (or 349196 counting only the distinct ones).

The product of its digits is 401408, while the sum is 49.

The square root of 78217888 is about 8844.0877426674. The cubic root of 78217888 is about 427.6633448953.

The spelling of 78217888 in words is "seventy-eight million, two hundred seventeen thousand, eight hundred eighty-eight".