40020004644444 has 72 divisors (see below), whose sum is σ = 110370843972480. Its totient is φ = 12125884096800.

The previous prime is 40020004644401. The next prime is 40020004644479. The reversal of 40020004644444 is 44444640002004.

40020004644444 is a `hidden beast` number, since 4 + 0 + 0 + 2 + 0 + 0 + 0 + 4 + 644 + 4 + 4 + 4 = 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 = 40020004644399 and 40020004644408.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2329984 + ... + 9244935.

Almost surely, 2^{40020004644444} is an apocalyptic number.

40020004644444 is a gapful number since it is divisible by the number (44) formed by its first and last digit.

It is an amenable number.

40020004644444 is an abundant number, since it is smaller than the sum of its proper divisors (70350839328036).

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

40020004644444 is a wasteful number, since it uses less digits than its factorization.

40020004644444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11583671 (or 11583666 counting only the distinct ones).

The product of its (nonzero) digits is 196608, while the sum is 36.

Adding to 40020004644444 its reverse (44444640002004), we get a palindrome (84464644646448).

The spelling of 40020004644444 in words is "forty trillion, twenty billion, four million, six hundred forty-four thousand, four hundred forty-four".