91147640 has 16 divisors (see below), whose sum is σ = 205082280. Its totient is φ = 36459040.

The previous prime is 91147577. The next prime is 91147673. The reversal of 91147640 is 4674119.

It is a junction number, because it is equal to n+sod(n) for n = 91147597 and 91147606.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1139306 + ... + 1139385.

Almost surely, 2^91147640 is an apocalyptic number.

It is an amenable number.

91147640 is an abundant number, since it is smaller than the sum of its proper divisors (113934640).

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

91147640 is a wasteful number, since it uses less digits than its factorization.

91147640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2278702 (or 2278698 counting only the distinct ones).

The product of its (nonzero) digits is 6048, while the sum is 32.

The square root of 91147640 is about 9547.1273166330. The cubic root of 91147640 is about 450.0372644038.

The spelling of 91147640 in words is "ninety-one million, one hundred forty-seven thousand, six hundred forty".