28312620 has 48 divisors (see below), whose sum is σ = 90601728. Its totient is φ = 6471360.

The previous prime is 28312607. The next prime is 28312621. The reversal of 28312620 is 2621382.

It is not an unprimeable number, because it can be changed into a prime (28312621) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 33286 + ... + 34125.

It is an arithmetic number, because the mean of its divisors is an integer number (1887536).

Almost surely, 2^28312620 is an apocalyptic number.

28312620 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28312620 is an abundant number, since it is smaller than the sum of its proper divisors (62289108).

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

28312620 is a wasteful number, since it uses less digits than its factorization.

28312620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67430 (or 67428 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 24.

The square root of 28312620 is about 5320.9604396199. The cubic root of 28312620 is about 304.7848343595.

The spelling of 28312620 in words is "twenty-eight million, three hundred twelve thousand, six hundred twenty".