28315650 has 72 divisors (see below), whose sum is σ = 77195952. Its totient is φ = 6812000.

The previous prime is 28315603. The next prime is 28315663. The reversal of 28315650 is 5651382.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 216085 + ... + 216215.

It is an arithmetic number, because the mean of its divisors is an integer number (1072166).

Almost surely, 2^28315650 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28315650, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38597976).

28315650 is an abundant number, since it is smaller than the sum of its proper divisors (48880302).

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

28315650 is a wasteful number, since it uses less digits than its factorization.

28315650 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 288 (or 152 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 30.

The square root of 28315650 is about 5321.2451550366. The cubic root of 28315650 is about 304.7957066032.

The spelling of 28315650 in words is "twenty-eight million, three hundred fifteen thousand, six hundred fifty".