78619091 has 6 divisors (see below), whose sum is σ = 79120740. Its totient is φ = 78120596.

The previous prime is 78619063. The next prime is 78619097. The reversal of 78619091 is 19091687.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-78619091 is a prime.

It is a super-2 number, since 2×78619091² = 12361922939332562, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78619097) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 26480 + ... + 29298.

It is an arithmetic number, because the mean of its divisors is an integer number (13186790).

Almost surely, 2^78619091 is an apocalyptic number.

78619091 is a deficient number, since it is larger than the sum of its proper divisors (501649).

78619091 is an equidigital number, since it uses as much as digits as its factorization.

78619091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3153 (or 2986 counting only the distinct ones).

The product of its (nonzero) digits is 27216, while the sum is 41.

The square root of 78619091 is about 8866.7407202421. The cubic root of 78619091 is about 428.3933027647.

The spelling of 78619091 in words is "seventy-eight million, six hundred nineteen thousand, ninety-one".