28699638 has 32 divisors (see below), whose sum is σ = 66303360. Its totient is φ = 8184960.

The previous prime is 28699613. The next prime is 28699639. The reversal of 28699638 is 83699682.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28699639) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11668 + ... + 13911.

It is an arithmetic number, because the mean of its divisors is an integer number (2071980).

Almost surely, 2^28699638 is an apocalyptic number.

28699638 is an abundant number, since it is smaller than the sum of its proper divisors (37603722).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28699638 is a wasteful number, since it uses less digits than its factorization.

28699638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25612.

The product of its digits is 1119744, while the sum is 51.

The square root of 28699638 is about 5357.2043082190. The cubic root of 28699638 is about 306.1673013966.

The spelling of 28699638 in words is "twenty-eight million, six hundred ninety-nine thousand, six hundred thirty-eight".