78574897 has 2 divisors, whose sum is σ = 78574898. Its totient is φ = 78574896.

The previous prime is 78574883. The next prime is 78574913. The reversal of 78574897 is 79847587.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 57744801 + 20830096 = 7599^2 + 4564^2 .

It is a cyclic number.

It is not a de Polignac number, because 78574897 - 2²³ = 70186289 is a prime.

It is not a weakly prime, because it can be changed into another prime (78574817) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39287448 + 39287449.

It is an arithmetic number, because the mean of its divisors is an integer number (39287449).

Almost surely, 2^78574897 is an apocalyptic number.

It is an amenable number.

78574897 is a deficient number, since it is larger than the sum of its proper divisors (1).

78574897 is an equidigital number, since it uses as much as digits as its factorization.

78574897 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3951360, while the sum is 55.

The square root of 78574897 is about 8864.2482478775. The cubic root of 78574897 is about 428.3130170819.

The spelling of 78574897 in words is "seventy-eight million, five hundred seventy-four thousand, eight hundred ninety-seven".