28371690 has 48 divisors (see below), whose sum is σ = 74131200. Its totient is φ = 7528416.

The previous prime is 28371689. The next prime is 28371697. The reversal of 28371690 is 9617382.

It is a super-2 number, since 2×28371690² = 1609905586912200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (28371697) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 20851 + ... + 22169.

It is an arithmetic number, because the mean of its divisors is an integer number (1544400).

Almost surely, 2^28371690 is an apocalyptic number.

28371690 is an abundant number, since it is smaller than the sum of its proper divisors (45759510).

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

28371690 is a wasteful number, since it uses less digits than its factorization.

28371690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1571 (or 1568 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 36.

The square root of 28371690 is about 5326.5082371099. The cubic root of 28371690 is about 304.9966496093.

The spelling of 28371690 in words is "twenty-eight million, three hundred seventy-one thousand, six hundred ninety".