28943580 has 24 divisors (see below), whose sum is σ = 81042192. Its totient is φ = 7718272.

The previous prime is 28943573. The next prime is 28943611. The reversal of 28943580 is 8534982.

It is a happy number.

It is a hoax number, since the sum of its digits (39) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

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, 241137 + ... + 241256.

It is an arithmetic number, because the mean of its divisors is an integer number (3376758).

Almost surely, 2^28943580 is an apocalyptic number.

28943580 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28943580 is an abundant number, since it is smaller than the sum of its proper divisors (52098612).

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

28943580 is a wasteful number, since it uses less digits than its factorization.

28943580 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 482405 (or 482403 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 39.

The square root of 28943580 is about 5379.9237912818. The cubic root of 28943580 is about 307.0323117076.

The spelling of 28943580 in words is "twenty-eight million, nine hundred forty-three thousand, five hundred eighty".