40028724 has 54 divisors (see below), whose sum is σ = 103133030. Its totient is φ = 13089600.

The previous prime is 40028713. The next prime is 40028767. The reversal of 40028724 is 42782004.

It can be written as a sum of positive squares in 3 ways, for example, as 31136400 + 8892324 = 5580^2 + 2982^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 367182 + ... + 367290.

Almost surely, 2^40028724 is an apocalyptic number.

It is an amenable number.

40028724 is an abundant number, since it is smaller than the sum of its proper divisors (63104306).

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

40028724 is a wasteful number, since it uses less digits than its factorization.

40028724 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 321 (or 215 counting only the distinct ones).

The product of its (nonzero) digits is 3584, while the sum is 27.

The square root of 40028724 is about 6326.8257443998. The cubic root of 40028724 is about 342.0770319965.

The spelling of 40028724 in words is "forty million, twenty-eight thousand, seven hundred twenty-four".