28197624 has 64 divisors (see below), whose sum is σ = 86768640. Its totient is φ = 7436160.

The previous prime is 28197623. The next prime is 28197629. The reversal of 28197624 is 42679182.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28197623) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4272 + ... + 8639.

It is an arithmetic number, because the mean of its divisors is an integer number (1355760).

Almost surely, 2^28197624 is an apocalyptic number.

28197624 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

28197624 is an abundant number, since it is smaller than the sum of its proper divisors (58571016).

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

28197624 is a wasteful number, since it uses less digits than its factorization.

28197624 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12940 (or 12936 counting only the distinct ones).

The product of its digits is 48384, while the sum is 39.

The square root of 28197624 is about 5310.1435008858. The cubic root of 28197624 is about 304.3716311484.

The spelling of 28197624 in words is "twenty-eight million, one hundred ninety-seven thousand, six hundred twenty-four".