28457424 has 30 divisors (see below), whose sum is σ = 79641666. Its totient is φ = 9485760.

The previous prime is 28457423. The next prime is 28457431. The reversal of 28457424 is 42475482.

28457424 is a `hidden beast` number, since 2 + 84 + 574 + 2 + 4 = 666.

It can be written as a sum of positive squares in only one way, i.e., 27751824 + 705600 = 5268^2 + 840^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28457423) 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, 98667 + ... + 98954.

Almost surely, 2^28457424 is an apocalyptic number.

28457424 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

28457424 is an abundant number, since it is smaller than the sum of its proper divisors (51184242).

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

28457424 is a wasteful number, since it uses less digits than its factorization.

28457424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 197635 (or 197626 counting only the distinct ones).

The product of its digits is 71680, while the sum is 36.

The square root of 28457424 is about 5334.5500278843. The cubic root of 28457424 is about 305.3035551686.

The spelling of 28457424 in words is "twenty-eight million, four hundred fifty-seven thousand, four hundred twenty-four".