78832390 has 32 divisors (see below), whose sum is σ = 174646080. Its totient is φ = 24948864.

The previous prime is 78832367. The next prime is 78832423. The reversal of 78832390 is 9323887.

It is a happy number.

It is a super-2 number, since 2×78832390² = 12429091426224200, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 42405 + ... + 44224.

It is an arithmetic number, because the mean of its divisors is an integer number (5457690).

Almost surely, 2^78832390 is an apocalyptic number.

78832390 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

78832390 is an abundant number, since it is smaller than the sum of its proper divisors (95813690).

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

78832390 is a wasteful number, since it uses less digits than its factorization.

78832390 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86656.

The product of its (nonzero) digits is 72576, while the sum is 40.

The square root of 78832390 is about 8878.7606117070. The cubic root of 78832390 is about 428.7803730888.

The spelling of 78832390 in words is "seventy-eight million, eight hundred thirty-two thousand, three hundred ninety".