44278021 has 4 divisors (see below), whose sum is σ = 44300844. Its totient is φ = 44255200.

The previous prime is 44278001. The next prime is 44278027. The reversal of 44278021 is 12087244.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 24117921 + 20160100 = 4911^2 + 4490^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-44278021 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 (44278027) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8200 + ... + 12481.

It is an arithmetic number, because the mean of its divisors is an integer number (11075211).

Almost surely, 2^44278021 is an apocalyptic number.

It is an amenable number.

44278021 is a deficient number, since it is larger than the sum of its proper divisors (22823).

44278021 is a wasteful number, since it uses less digits than its factorization.

44278021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22822.

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

The square root of 44278021 is about 6654.1732018336. The cubic root of 44278021 is about 353.7768418078.

The spelling of 44278021 in words is "forty-four million, two hundred seventy-eight thousand, twenty-one".