28940815 has 8 divisors (see below), whose sum is σ = 34787808. Its totient is φ = 23113440.

The previous prime is 28940797. The next prime is 28940881. The reversal of 28940815 is 51804982.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 28940815 - 2⁷ = 28940687 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1432 + ... + 7741.

It is an arithmetic number, because the mean of its divisors is an integer number (4348476).

Almost surely, 2^28940815 is an apocalyptic number.

28940815 is a deficient number, since it is larger than the sum of its proper divisors (5846993).

28940815 is an equidigital number, since it uses as much as digits as its factorization.

28940815 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9809.

The product of its (nonzero) digits is 23040, while the sum is 37.

The square root of 28940815 is about 5379.6668112440. Note that the first 3 decimals coincide. The cubic root of 28940815 is about 307.0225343940.

The spelling of 28940815 in words is "twenty-eight million, nine hundred forty thousand, eight hundred fifteen".