78331288 has 16 divisors (see below), whose sum is σ = 167852880. Its totient is φ = 33570528.

The previous prime is 78331277. The next prime is 78331289. The reversal of 78331288 is 88213387.

It is a super-2 number, since 2×78331288² = 12271581359477888, 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 78331288.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78331289) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 699331 + ... + 699442.

It is an arithmetic number, because the mean of its divisors is an integer number (10490805).

Almost surely, 2^78331288 is an apocalyptic number.

It is an amenable number.

78331288 is an abundant number, since it is smaller than the sum of its proper divisors (89521592).

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

78331288 is a wasteful number, since it uses less digits than its factorization.

78331288 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1398786 (or 1398782 counting only the distinct ones).

The product of its digits is 64512, while the sum is 40.

The square root of 78331288 is about 8850.4964832488. The cubic root of 78331288 is about 427.8699200001.

The spelling of 78331288 in words is "seventy-eight million, three hundred thirty-one thousand, two hundred eighty-eight".