78619961 has 12 divisors (see below), whose sum is σ = 91623168. Its totient is φ = 67265352.

The previous prime is 78619939. The next prime is 78619969. The reversal of 78619961 is 16991687.

It is not a de Polignac number, because 78619961 - 2⁶ = 78619897 is a prime.

It is not an unprimeable number, because it can be changed into a prime (78619969) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 34520 + ... + 36726.

It is an arithmetic number, because the mean of its divisors is an integer number (7635264).

Almost surely, 2^78619961 is an apocalyptic number.

It is an amenable number.

78619961 is a deficient number, since it is larger than the sum of its proper divisors (13003207).

78619961 is a wasteful number, since it uses less digits than its factorization.

78619961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2948 (or 2941 counting only the distinct ones).

The product of its digits is 163296, while the sum is 47.

The square root of 78619961 is about 8866.7897798470. The cubic root of 78619961 is about 428.3948829611.

The spelling of 78619961 in words is "seventy-eight million, six hundred nineteen thousand, nine hundred sixty-one".