28641560 has 32 divisors (see below), whose sum is σ = 66668400. Its totient is φ = 11061120.

The previous prime is 28641559. The next prime is 28641563. The reversal of 28641560 is 6514682.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28641563) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11186 + ... + 13505.

Almost surely, 2^28641560 is an apocalyptic number.

28641560 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28641560 is an abundant number, since it is smaller than the sum of its proper divisors (38026840).

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

28641560 is a wasteful number, since it uses less digits than its factorization.

28641560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24731 (or 24727 counting only the distinct ones).

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

The square root of 28641560 is about 5351.7810119623. The cubic root of 28641560 is about 305.9606368550.

The spelling of 28641560 in words is "twenty-eight million, six hundred forty-one thousand, five hundred sixty".