28549660 has 12 divisors (see below), whose sum is σ = 59954328. Its totient is φ = 11419856.

The previous prime is 28549657. The next prime is 28549663. The reversal of 28549660 is 6694582.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (28549657) and next prime (28549663).

It is a super-2 number, since 2×28549660² = 1630166172231200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28549663) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 713722 + ... + 713761.

It is an arithmetic number, because the mean of its divisors is an integer number (4996194).

Almost surely, 2^28549660 is an apocalyptic number.

28549660 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28549660 is an abundant number, since it is smaller than the sum of its proper divisors (31404668).

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

28549660 is a wasteful number, since it uses less digits than its factorization.

28549660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1427492 (or 1427490 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 40.

The square root of 28549660 is about 5343.1881868413. The cubic root of 28549660 is about 305.6330486768.

The spelling of 28549660 in words is "twenty-eight million, five hundred forty-nine thousand, six hundred sixty".