40091664 has 40 divisors (see below), whose sum is σ = 104136192. Its totient is φ = 13290880.

The previous prime is 40091657. The next prime is 40091671. The reversal of 40091664 is 46619004.

It is an interprime number because it is at equal distance from previous prime (40091657) and next prime (40091671).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6982 + ... + 11354.

Almost surely, 2^40091664 is an apocalyptic number.

It is an amenable number.

40091664 is an abundant number, since it is smaller than the sum of its proper divisors (64044528).

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

40091664 is a wasteful number, since it uses less digits than its factorization.

40091664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4575 (or 4569 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 30.

The square root of 40091664 is about 6331.7978489525. The cubic root of 40091664 is about 342.2562287627.

It can be divided in two parts, 40091 and 664, that added together give a triangular number (40755 = T₂₈₅).

The spelling of 40091664 in words is "forty million, ninety-one thousand, six hundred sixty-four".