28572380 has 24 divisors (see below), whose sum is σ = 60108048. Its totient is φ = 11408768.

The previous prime is 28572347. The next prime is 28572391. The reversal of 28572380 is 8327582.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 28572380.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16307 + ... + 17973.

It is an arithmetic number, because the mean of its divisors is an integer number (2504502).

Almost surely, 2^28572380 is an apocalyptic number.

28572380 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28572380 is an abundant number, since it is smaller than the sum of its proper divisors (31535668).

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

28572380 is a wasteful number, since it uses less digits than its factorization.

28572380 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2533 (or 2531 counting only the distinct ones).

The product of its (nonzero) digits is 26880, while the sum is 35.

The square root of 28572380 is about 5345.3138355011. The cubic root of 28572380 is about 305.7141020841.

The spelling of 28572380 in words is "twenty-eight million, five hundred seventy-two thousand, three hundred eighty".