28956870 has 24 divisors (see below), whose sum is σ = 75288096. Its totient is φ = 7721808.

The previous prime is 28956869. The next prime is 28956871. The reversal of 28956870 is 7865982.

28956870 is a `hidden beast` number, since 2 + 89 + 568 + 7 + 0 = 666.

It is an interprime number because it is at equal distance from previous prime (28956869) and next prime (28956871).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28956871) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 160782 + ... + 160961.

It is an arithmetic number, because the mean of its divisors is an integer number (3137004).

Almost surely, 2^28956870 is an apocalyptic number.

28956870 is an abundant number, since it is smaller than the sum of its proper divisors (46331226).

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

28956870 is a wasteful number, since it uses less digits than its factorization.

28956870 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 321756 (or 321753 counting only the distinct ones).

The product of its (nonzero) digits is 241920, while the sum is 45.

The square root of 28956870 is about 5381.1587971365. The cubic root of 28956870 is about 307.0792977755.

The spelling of 28956870 in words is "twenty-eight million, nine hundred fifty-six thousand, eight hundred seventy".