28424772 has 18 divisors (see below), whose sum is σ = 71851598. Its totient is φ = 9474912.

The previous prime is 28424771. The next prime is 28424791. The reversal of 28424772 is 27742482.

It can be written as a sum of positive squares in only one way, i.e., 27625536 + 799236 = 5256^2 + 894^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 789577 = 28424772 / (2 + 8 + 4 + 2 + 4 + 7 + 7 + 2).

It is not an unprimeable number, because it can be changed into a prime (28424771) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 394753 + ... + 394824.

Almost surely, 2^28424772 is an apocalyptic number.

It is an amenable number.

28424772 is an abundant number, since it is smaller than the sum of its proper divisors (43426826).

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

28424772 is a wasteful number, since it uses less digits than its factorization.

28424772 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 789587 (or 789582 counting only the distinct ones).

The product of its digits is 50176, while the sum is 36.

The square root of 28424772 is about 5331.4887226740. The cubic root of 28424772 is about 305.1867422199.

The spelling of 28424772 in words is "twenty-eight million, four hundred twenty-four thousand, seven hundred seventy-two".