28520670 has 16 divisors (see below), whose sum is σ = 68449680. Its totient is φ = 7605504.

The previous prime is 28520669. The next prime is 28520689. The reversal of 28520670 is 7602582.

It is a super-3 number, since 3×28520670³ (a number of 23 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (30), and also a Moran number because the ratio is a prime number: 950689 = 28520670 / (2 + 8 + 5 + 2 + 0 + 6 + 7 + 0).

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, 475315 + ... + 475374.

It is an arithmetic number, because the mean of its divisors is an integer number (4278105).

Almost surely, 2^28520670 is an apocalyptic number.

28520670 is an abundant number, since it is smaller than the sum of its proper divisors (39929010).

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

28520670 is a wasteful number, since it uses less digits than its factorization.

28520670 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 950699.

The product of its (nonzero) digits is 6720, while the sum is 30.

The square root of 28520670 is about 5340.4746980020. The cubic root of 28520670 is about 305.5295646334.

The spelling of 28520670 in words is "twenty-eight million, five hundred twenty thousand, six hundred seventy".