28307650 has 48 divisors (see below), whose sum is σ = 62138880. Its totient is φ = 9388800.

The previous prime is 28307647. The next prime is 28307651. The reversal of 28307650 is 5670382.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28307651) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9546 + ... + 12154.

It is an arithmetic number, because the mean of its divisors is an integer number (1294560).

Almost surely, 2^28307650 is an apocalyptic number.

28307650 is an abundant number, since it is smaller than the sum of its proper divisors (33831230).

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

28307650 is a wasteful number, since it uses less digits than its factorization.

28307650 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2659 (or 2654 counting only the distinct ones).

The product of its (nonzero) digits is 10080, while the sum is 31.

The square root of 28307650 is about 5320.4933981728. The cubic root of 28307650 is about 304.7669993297.

The spelling of 28307650 in words is "twenty-eight million, three hundred seven thousand, six hundred fifty".