28809970 has 32 divisors (see below), whose sum is σ = 59891328. Its totient is φ = 9773568.

The previous prime is 28809967. The next prime is 28809983. The reversal of 28809970 is 7990882.

It is a Smith number, since the sum of its digits (43) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4669 + ... + 8911.

It is an arithmetic number, because the mean of its divisors is an integer number (1871604).

Almost surely, 2^28809970 is an apocalyptic number.

28809970 is the 3395-th heptagonal number.

28809970 is an abundant number, since it is smaller than the sum of its proper divisors (31081358).

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

28809970 is a wasteful number, since it uses less digits than its factorization.

28809970 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4354.

The product of its (nonzero) digits is 72576, while the sum is 43.

The square root of 28809970 is about 5367.4919655273. The cubic root of 28809970 is about 306.5591397333.

The spelling of 28809970 in words is "twenty-eight million, eight hundred nine thousand, nine hundred seventy".