28051870 has 64 divisors (see below), whose sum is σ = 66686976. Its totient is φ = 8225280.

The previous prime is 28051861. The next prime is 28051879. The reversal of 28051870 is 7815082.

It is an interprime number because it is at equal distance from previous prime (28051861) and next prime (28051879).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28051879) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 12019 + ... + 14161.

It is an arithmetic number, because the mean of its divisors is an integer number (1041984).

Almost surely, 2^28051870 is an apocalyptic number.

28051870 is an abundant number, since it is smaller than the sum of its proper divisors (38635106).

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

28051870 is a wasteful number, since it uses less digits than its factorization.

28051870 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2185.

The product of its (nonzero) digits is 4480, while the sum is 31.

The square root of 28051870 is about 5296.4016086396. The cubic root of 28051870 is about 303.8462908886.

The spelling of 28051870 in words is "twenty-eight million, fifty-one thousand, eight hundred seventy".