28571990 has 8 divisors (see below), whose sum is σ = 51429600. Its totient is φ = 11428792.

The previous prime is 28571969. The next prime is 28571993. The reversal of 28571990 is 9917582.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×28571990² = 1632717225120200, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28571993) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1428590 + ... + 1428609.

It is an arithmetic number, because the mean of its divisors is an integer number (6428700).

Almost surely, 2^28571990 is an apocalyptic number.

28571990 is a deficient number, since it is larger than the sum of its proper divisors (22857610).

28571990 is a wasteful number, since it uses less digits than its factorization.

28571990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2857206.

The product of its (nonzero) digits is 45360, while the sum is 41.

The square root of 28571990 is about 5345.2773548245. The cubic root of 28571990 is about 305.7127111249.

The spelling of 28571990 in words is "twenty-eight million, five hundred seventy-one thousand, nine hundred ninety".