28097400 has 48 divisors (see below), whose sum is σ = 87103800. Its totient is φ = 7492480.

The previous prime is 28097387. The next prime is 28097411. The reversal of 28097400 is 479082.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 22815 + ... + 24014.

Almost surely, 2^28097400 is an apocalyptic number.

28097400 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28097400 is an abundant number, since it is smaller than the sum of its proper divisors (59006400).

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

28097400 is a wasteful number, since it uses less digits than its factorization.

28097400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46848 (or 46839 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 30.

The square root of 28097400 is about 5300.6980672361. The cubic root of 28097400 is about 304.0105894280.

The spelling of 28097400 in words is "twenty-eight million, ninety-seven thousand, four hundred".