78890331 has 16 divisors (see below), whose sum is σ = 113460480. Its totient is φ = 48469920.

The previous prime is 78890323. The next prime is 78890333. The reversal of 78890331 is 13309887.

It is not a de Polignac number, because 78890331 - 2³ = 78890323 is a prime.

It is a super-2 number, since 2×78890331² = 12447368650579122, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a self number, because there is not a number n which added to its sum of digits gives 78890331.

It is not an unprimeable number, because it can be changed into a prime (78890333) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 31516 + ... + 33926.

It is an arithmetic number, because the mean of its divisors is an integer number (7091280).

Almost surely, 2^78890331 is an apocalyptic number.

78890331 is a deficient number, since it is larger than the sum of its proper divisors (34570149).

78890331 is a wasteful number, since it uses less digits than its factorization.

78890331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3266.

The product of its (nonzero) digits is 36288, while the sum is 39.

The square root of 78890331 is about 8882.0229114769. The cubic root of 78890331 is about 428.8853970914.

It can be divided in two parts, 788 and 90331, that added together give a palindrome (91119).

The spelling of 78890331 in words is "seventy-eight million, eight hundred ninety thousand, three hundred thirty-one".