91440740 has 12 divisors (see below), whose sum is σ = 192025596. Its totient is φ = 36576288.

The previous prime is 91440719. The next prime is 91440763. The reversal of 91440740 is 4704419.

It can be written as a sum of positive squares in 2 ways, for example, as 61058596 + 30382144 = 7814^2 + 5512^2 .

It is a super-2 number, since 2×91440740² = 16722817863495200, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2285999 + ... + 2286038.

It is an arithmetic number, because the mean of its divisors is an integer number (16002133).

Almost surely, 2^91440740 is an apocalyptic number.

It is an amenable number.

91440740 is an abundant number, since it is smaller than the sum of its proper divisors (100584856).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

91440740 is a wasteful number, since it uses less digits than its factorization.

91440740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4572046 (or 4572044 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 29.

The square root of 91440740 is about 9562.4651633352. The cubic root of 91440740 is about 450.5191374980.

The spelling of 91440740 in words is "ninety-one million, four hundred forty thousand, seven hundred forty".