28359640 has 16 divisors (see below), whose sum is σ = 63809280. Its totient is φ = 11343840.

The previous prime is 28359631. The next prime is 28359671. The reversal of 28359640 is 4695382.

It is a self number, because there is not a number n which added to its sum of digits gives 28359640.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 354456 + ... + 354535.

It is an arithmetic number, because the mean of its divisors is an integer number (3988080).

Almost surely, 2^28359640 is an apocalyptic number.

28359640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28359640 is an abundant number, since it is smaller than the sum of its proper divisors (35449640).

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

28359640 is a wasteful number, since it uses less digits than its factorization.

28359640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 709002 (or 708998 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 37.

The square root of 28359640 is about 5325.3769819610. The cubic root of 28359640 is about 304.9534641892.

The spelling of 28359640 in words is "twenty-eight million, three hundred fifty-nine thousand, six hundred forty".