28707570 has 48 divisors (see below), whose sum is σ = 74954880. Its totient is φ = 7623072.

The previous prime is 28707563. The next prime is 28707583. The reversal of 28707570 is 7570782.

28707570 is a `hidden beast` number, since 2 + 87 + 0 + 7 + 570 = 666.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 27111 + ... + 28149.

It is an arithmetic number, because the mean of its divisors is an integer number (1561560).

Almost surely, 2^28707570 is an apocalyptic number.

28707570 is an abundant number, since it is smaller than the sum of its proper divisors (46247310).

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

28707570 is a wasteful number, since it uses less digits than its factorization.

28707570 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1359 (or 1356 counting only the distinct ones).

The product of its (nonzero) digits is 27440, while the sum is 36.

The square root of 28707570 is about 5357.9445685822. The cubic root of 28707570 is about 306.1955049502.

It can be divided in two parts, 2870 and 7570, that added together give a triangular number (10440 = T₁₄₄).

The spelling of 28707570 in words is "twenty-eight million, seven hundred seven thousand, five hundred seventy".