78047923 has 2 divisors, whose sum is σ = 78047924. Its totient is φ = 78047922.

The previous prime is 78047909. The next prime is 78047933. The reversal of 78047923 is 32974087.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 78047923 - 2⁵ = 78047891 is a prime.

It is a super-2 number, since 2×78047923² = 12182956569227858, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (78047933) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39023961 + 39023962.

It is an arithmetic number, because the mean of its divisors is an integer number (39023962).

Almost surely, 2^78047923 is an apocalyptic number.

78047923 is a deficient number, since it is larger than the sum of its proper divisors (1).

78047923 is an equidigital number, since it uses as much as digits as its factorization.

78047923 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 84672, while the sum is 40.

The square root of 78047923 is about 8834.4735553399. The cubic root of 78047923 is about 427.3533539398.

The spelling of 78047923 in words is "seventy-eight million, forty-seven thousand, nine hundred twenty-three".