40489960644 has 48 divisors (see below), whose sum is σ = 119970256000. Its totient is φ = 11568559968.

The previous prime is 40489960627. The next prime is 40489960663. The reversal of 40489960644 is 44606998404.

It is a happy number.

40489960644 is a `hidden beast` number, since 40 + 489 + 9 + 60 + 64 + 4 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 26778319 + ... + 26779830.

Almost surely, 2^40489960644 is an apocalyptic number.

It is an amenable number.

40489960644 is an abundant number, since it is smaller than the sum of its proper divisors (79480295356).

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

40489960644 is a wasteful number, since it uses less digits than its factorization.

40489960644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53558169 (or 53558161 counting only the distinct ones).

The product of its (nonzero) digits is 5971968, while the sum is 54.

The spelling of 40489960644 in words is "forty billion, four hundred eighty-nine million, nine hundred sixty thousand, six hundred forty-four".