44728021 has 8 divisors (see below), whose sum is σ = 48346424. Its totient is φ = 41135040.

The previous prime is 44728001. The next prime is 44728027. The reversal of 44728021 is 12082744.

It can be written as a sum of positive squares in 4 ways, for example, as 4468996 + 40259025 = 2114^2 + 6345^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 44728021 - 2⁵ = 44727989 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (44728027) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2610 + ... + 9811.

It is an arithmetic number, because the mean of its divisors is an integer number (6043303).

Almost surely, 2^44728021 is an apocalyptic number.

It is an amenable number.

44728021 is a deficient number, since it is larger than the sum of its proper divisors (3618403).

44728021 is a wasteful number, since it uses less digits than its factorization.

44728021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12711.

The product of its (nonzero) digits is 3584, while the sum is 28.

The square root of 44728021 is about 6687.9010907758. The cubic root of 44728021 is about 354.9712890885.

The spelling of 44728021 in words is "forty-four million, seven hundred twenty-eight thousand, twenty-one".