28390492 has 24 divisors (see below), whose sum is σ = 54753776. Its totient is φ = 12797568.

The previous prime is 28390489. The next prime is 28390517. The reversal of 28390492 is 29409382.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4113 + ... + 8584.

Almost surely, 2^28390492 is an apocalyptic number.

It is an amenable number.

28390492 is a deficient number, since it is larger than the sum of its proper divisors (26363284).

28390492 is a wasteful number, since it uses less digits than its factorization.

28390492 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12757 (or 12755 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 37.

The square root of 28390492 is about 5328.2728909094. The cubic root of 28390492 is about 305.0640087821.

It can be divided in two parts, 28390 and 492, that added together give a palindrome (28882).

The spelling of 28390492 in words is "twenty-eight million, three hundred ninety thousand, four hundred ninety-two".