44905639821 has 24 divisors (see below), whose sum is σ = 69660256320. Its totient is φ = 25656426432.

The previous prime is 44905639789. The next prime is 44905639847. The reversal of 44905639821 is 12893650944.

It is not a de Polignac number, because 44905639821 - 2⁵ = 44905639789 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (44905639861) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1129560 + ... + 1168638.

It is an arithmetic number, because the mean of its divisors is an integer number (2902510680).

Almost surely, 2^44905639821 is an apocalyptic number.

It is an amenable number.

44905639821 is a deficient number, since it is larger than the sum of its proper divisors (24754616499).

44905639821 is a wasteful number, since it uses less digits than its factorization.

44905639821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46913 (or 46906 counting only the distinct ones).

The product of its (nonzero) digits is 1866240, while the sum is 51.

The spelling of 44905639821 in words is "forty-four billion, nine hundred five million, six hundred thirty-nine thousand, eight hundred twenty-one".