28292638 has 16 divisors (see below), whose sum is σ = 46417536. Its totient is φ = 12826840.

The previous prime is 28292617. The next prime is 28292647. The reversal of 28292638 is 83629282.

It is a self number, because there is not a number n which added to its sum of digits gives 28292638.

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, 8295 + ... + 11197.

It is an arithmetic number, because the mean of its divisors is an integer number (2901096).

Almost surely, 2^28292638 is an apocalyptic number.

28292638 is a deficient number, since it is larger than the sum of its proper divisors (18124898).

28292638 is a wasteful number, since it uses less digits than its factorization.

28292638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3359.

The product of its digits is 82944, while the sum is 40.

The square root of 28292638 is about 5319.0824396695. The cubic root of 28292638 is about 304.7131155304.

The spelling of 28292638 in words is "twenty-eight million, two hundred ninety-two thousand, six hundred thirty-eight".