40747644 has 48 divisors (see below), whose sum is σ = 120736000. Its totient is φ = 11641968.

The previous prime is 40747631. The next prime is 40747667. The reversal of 40747644 is 44674704.

40747644 is a `hidden beast` number, since 4 + 0 + 7 + 4 + 7 + 644 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 40747599 and 40747608.

It is a congruent number.

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, 26194 + ... + 27705.

Almost surely, 2^40747644 is an apocalyptic number.

It is an amenable number.

40747644 is an abundant number, since it is smaller than the sum of its proper divisors (79988356).

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

40747644 is a wasteful number, since it uses less digits than its factorization.

40747644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53919 (or 53911 counting only the distinct ones).

The product of its (nonzero) digits is 75264, while the sum is 36.

The square root of 40747644 is about 6383.3881285725. The cubic root of 40747644 is about 344.1128055319.

The spelling of 40747644 in words is "forty million, seven hundred forty-seven thousand, six hundred forty-four".