91678756225 has 81 divisors (see below), whose sum is σ = 136191452553. Its totient is φ = 61041456000.

The previous prime is 91678756207. The next prime is 91678756241. The reversal of 91678756225 is 52265787619.

The square root of 91678756225 is 302785.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 38589066481 + 53089689744 = 196441^2 + 230412^2 .

It is not a de Polignac number, because 91678756225 - 2⁵ = 91678756193 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 91678756225.

It is an unprimeable number.

It is a polite number, since it can be written in 80 ways as a sum of consecutive naturals, for example, 434496370 + ... + 434496580.

Almost surely, 2^91678756225 is an apocalyptic number.

91678756225 is the 302785-th square number.

91678756225 is the 151393-rd centered octagonal number.

It is an amenable number.

91678756225 is a deficient number, since it is larger than the sum of its proper divisors (44512696328).

91678756225 is an equidigital number, since it uses as much as digits as its factorization.

91678756225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 528 (or 264 counting only the distinct ones).

The product of its digits is 12700800, while the sum is 58.

The spelling of 91678756225 in words is "ninety-one billion, six hundred seventy-eight million, seven hundred fifty-six thousand, two hundred twenty-five".