91278916 has 27 divisors (see below), whose sum is σ = 170293207. Its totient is φ = 42801920.

The previous prime is 91278893. The next prime is 91278917. The reversal of 91278916 is 61987219.

The square root of 91278916 is 9554.

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 19096900 + 72182016 = 4370^2 + 8496^2 .

It is a super-2 number, since 2×91278916² = 16663681012270112, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91278917) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 324696 + ... + 324976.

Almost surely, 2^91278916 is an apocalyptic number.

91278916 is the 9554-th square number.

It is an amenable number.

91278916 is a deficient number, since it is larger than the sum of its proper divisors (79014291).

91278916 is a wasteful number, since it uses less digits than its factorization.

91278916 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 600 (or 300 counting only the distinct ones).

The product of its digits is 54432, while the sum is 43.

The cubic root of 91278916 is about 450.2532171575.

The spelling of 91278916 in words is "ninety-one million, two hundred seventy-eight thousand, nine hundred sixteen".