28451900 has 36 divisors (see below), whose sum is σ = 63876120. Its totient is φ = 10987200.

The previous prime is 28451887. The next prime is 28451903. The reversal of 28451900 is 915482.

It is a super-2 number, since 2×28451900² = 1619021227220000, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (29).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28451903) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 2006 + ... + 7805.

Almost surely, 2^28451900 is an apocalyptic number.

28451900 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28451900 is an abundant number, since it is smaller than the sum of its proper divisors (35424220).

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

28451900 is a wasteful number, since it uses less digits than its factorization.

28451900 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9854 (or 9847 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 29.

The square root of 28451900 is about 5334.0322458718. The cubic root of 28451900 is about 305.2837992697.

The spelling of 28451900 in words is "twenty-eight million, four hundred fifty-one thousand, nine hundred".