28916390 has 8 divisors (see below), whose sum is σ = 52049520. Its totient is φ = 11566552.

The previous prime is 28916387. The next prime is 28916399. The reversal of 28916390 is 9361982.

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

It is a super-2 number, since 2×28916390² = 1672315221264200, 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 (28916399) 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, 1445810 + ... + 1445829.

It is an arithmetic number, because the mean of its divisors is an integer number (6506190).

Almost surely, 2^28916390 is an apocalyptic number.

28916390 is a deficient number, since it is larger than the sum of its proper divisors (23133130).

28916390 is a wasteful number, since it uses less digits than its factorization.

28916390 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2891646.

The product of its (nonzero) digits is 23328, while the sum is 38.

The square root of 28916390 is about 5377.3962100630. The cubic root of 28916390 is about 306.9361381168.

The spelling of 28916390 in words is "twenty-eight million, nine hundred sixteen thousand, three hundred ninety".