28451660 has 12 divisors (see below), whose sum is σ = 59748528. Its totient is φ = 11380656.

The previous prime is 28451651. The next prime is 28451669. The reversal of 28451660 is 6615482.

It is an interprime number because it is at equal distance from previous prime (28451651) and next prime (28451669).

It is a hoax number, since the sum of its digits (32) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (28451669) 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 3 ways as a sum of consecutive naturals, for example, 711272 + ... + 711311.

It is an arithmetic number, because the mean of its divisors is an integer number (4979044).

Almost surely, 2^28451660 is an apocalyptic number.

28451660 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28451660 is an abundant number, since it is smaller than the sum of its proper divisors (31296868).

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

28451660 is a wasteful number, since it uses less digits than its factorization.

28451660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1422592 (or 1422590 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 32.

The square root of 28451660 is about 5334.0097487725. The cubic root of 28451660 is about 305.2829408816.

The spelling of 28451660 in words is "twenty-eight million, four hundred fifty-one thousand, six hundred sixty".