28197880 has 16 divisors (see below), whose sum is σ = 63445320. Its totient is φ = 11279136.

The previous prime is 28197877. The next prime is 28197899. The reversal of 28197880 is 8879182.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 352434 + ... + 352513.

Almost surely, 2^28197880 is an apocalyptic number.

28197880 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28197880 is an abundant number, since it is smaller than the sum of its proper divisors (35247440).

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

28197880 is a wasteful number, since it uses less digits than its factorization.

28197880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 704958 (or 704954 counting only the distinct ones).

The product of its (nonzero) digits is 64512, while the sum is 43.

The square root of 28197880 is about 5310.1676056411. The cubic root of 28197880 is about 304.3725522532.

The spelling of 28197880 in words is "twenty-eight million, one hundred ninety-seven thousand, eight hundred eighty".