28025990 has 8 divisors (see below), whose sum is σ = 50446800. Its totient is φ = 11210392.

The previous prime is 28025989. The next prime is 28025999. The reversal of 28025990 is 9952082.

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

It is a super-2 number, since 2×28025990² = 1570912230960200, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 28025990.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28025999) 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, 1401290 + ... + 1401309.

It is an arithmetic number, because the mean of its divisors is an integer number (6305850).

Almost surely, 2^28025990 is an apocalyptic number.

28025990 is a deficient number, since it is larger than the sum of its proper divisors (22420810).

28025990 is a wasteful number, since it uses less digits than its factorization.

28025990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2802606.

The product of its (nonzero) digits is 12960, while the sum is 35.

The square root of 28025990 is about 5293.9578766741. The cubic root of 28025990 is about 303.7528216417.

The spelling of 28025990 in words is "twenty-eight million, twenty-five thousand, nine hundred ninety".