78237768 has 32 divisors (see below), whose sum is σ = 223536960. Its totient is φ = 22353600.

The previous prime is 78237749. The next prime is 78237779. The reversal of 78237768 is 86773287.

It is a super-2 number, since 2×78237768² = 12242296683243648, which contains 22 as substring.

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 7 ways as a sum of consecutive naturals, for example, 232683 + ... + 233018.

It is an arithmetic number, because the mean of its divisors is an integer number (6985530).

Almost surely, 2^78237768 is an apocalyptic number.

It is an amenable number.

78237768 is an abundant number, since it is smaller than the sum of its proper divisors (145299192).

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

78237768 is a wasteful number, since it uses less digits than its factorization.

78237768 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 465717 (or 465713 counting only the distinct ones).

The product of its digits is 790272, while the sum is 48.

The square root of 78237768 is about 8845.2115859373. The cubic root of 78237768 is about 427.6995737227.

The spelling of 78237768 in words is "seventy-eight million, two hundred thirty-seven thousand, seven hundred sixty-eight".