40561644 has 12 divisors (see below), whose sum is σ = 94643864. Its totient is φ = 13520544.

The previous prime is 40561639. The next prime is 40561663. The reversal of 40561644 is 44616504.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-3 number, since 3×40561644³ (a number of 24 digits) contains 333 as substring.

It is a hoax number, since the sum of its digits (30) coincides with the sum of the digits of its distinct prime factors.

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, 1690057 + ... + 1690080.

Almost surely, 2^40561644 is an apocalyptic number.

It is an amenable number.

40561644 is an abundant number, since it is smaller than the sum of its proper divisors (54082220).

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

40561644 is a wasteful number, since it uses less digits than its factorization.

40561644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3380144 (or 3380142 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 30.

The square root of 40561644 is about 6368.8023991956. The cubic root of 40561644 is about 343.5884184287.

The spelling of 40561644 in words is "forty million, five hundred sixty-one thousand, six hundred forty-four".