28940400 has 90 divisors (see below), whose sum is σ = 100443720. Its totient is φ = 7716480.

The previous prime is 28940399. The next prime is 28940423. The reversal of 28940400 is 404982.

It is a tau number, because it is divible by the number of its divisors (90).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 420 + ... + 7619.

Almost surely, 2^28940400 is an apocalyptic number.

28940400 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28940400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (50221860).

28940400 is an abundant number, since it is smaller than the sum of its proper divisors (71503320).

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

28940400 is a wasteful number, since it uses less digits than its factorization.

28940400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8063 (or 8049 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 27.

The square root of 28940400 is about 5379.6282399437. The cubic root of 28940400 is about 307.0210668592.

The spelling of 28940400 in words is "twenty-eight million, nine hundred forty thousand, four hundred".