91504840 has 64 divisors (see below), whose sum is σ = 236338560. Its totient is φ = 31234560.

The previous prime is 91504837. The next prime is 91504841. The reversal of 91504840 is 4840519.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (91504841) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 78099 + ... + 79261.

It is an arithmetic number, because the mean of its divisors is an integer number (3692790).

Almost surely, 2^91504840 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 91504840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (118169280).

91504840 is an abundant number, since it is smaller than the sum of its proper divisors (144833720).

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

91504840 is a wasteful number, since it uses less digits than its factorization.

91504840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1462 (or 1458 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 31.

The square root of 91504840 is about 9565.8162223618. The cubic root of 91504840 is about 450.6243842820.

The spelling of 91504840 in words is "ninety-one million, five hundred four thousand, eight hundred forty".