28198464 has 56 divisors (see below), whose sum is σ = 85270848. Its totient is φ = 8056320.

The previous prime is 28198453. The next prime is 28198487. The reversal of 28198464 is 46489182.

It is a tau number, because it is divible by the number of its divisors (56).

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9147 + ... + 11834.

Almost surely, 2^28198464 is an apocalyptic number.

28198464 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

28198464 is an abundant number, since it is smaller than the sum of its proper divisors (57072384).

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

28198464 is a wasteful number, since it uses less digits than its factorization.

28198464 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21003 (or 20993 counting only the distinct ones).

The product of its digits is 110592, while the sum is 42.

The square root of 28198464 is about 5310.2225942045. Note that the first 3 decimals coincide. The cubic root of 28198464 is about 304.3746535027.

The spelling of 28198464 in words is "twenty-eight million, one hundred ninety-eight thousand, four hundred sixty-four".