40891664 has 80 divisors (see below), whose sum is σ = 93208320. Its totient is φ = 17172480.

The previous prime is 40891657. The next prime is 40891691. The reversal of 40891664 is 46619804.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 236282 + ... + 236454.

It is an arithmetic number, because the mean of its divisors is an integer number (1165104).

Almost surely, 2^40891664 is an apocalyptic number.

40891664 is a gapful number since it is divisible by the number (44) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 40891664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (46604160).

40891664 is an abundant number, since it is smaller than the sum of its proper divisors (52316656).

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

40891664 is a wasteful number, since it uses less digits than its factorization.

40891664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 288 (or 282 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 38.

The square root of 40891664 is about 6394.6590214022. The cubic root of 40891664 is about 344.5177438948.

The spelling of 40891664 in words is "forty million, eight hundred ninety-one thousand, six hundred sixty-four".