78330891 has 8 divisors (see below), whose sum is σ = 104819344. Its totient is φ = 52031520.

The previous prime is 78330877. The next prime is 78330899. The reversal of 78330891 is 19803387.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 78330891 - 2¹⁵ = 78298123 is a prime.

It is a super-2 number, since 2×78330891² = 12271456969707762, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78330899) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 46300 + ... + 47961.

It is an arithmetic number, because the mean of its divisors is an integer number (13102418).

Almost surely, 2^78330891 is an apocalyptic number.

78330891 is a deficient number, since it is larger than the sum of its proper divisors (26488453).

78330891 is a wasteful number, since it uses less digits than its factorization.

78330891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 94541.

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

The square root of 78330891 is about 8850.4740551001. The cubic root of 78330891 is about 427.8691971529.

The spelling of 78330891 in words is "seventy-eight million, three hundred thirty thousand, eight hundred ninety-one".