28518690 has 64 divisors (see below), whose sum is σ = 73094400. Its totient is φ = 7096320.

The previous prime is 28518683. The next prime is 28518701. The reversal of 28518690 is 9681582.

It is a super-2 number, since 2×28518690² = 1626631358632200, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 101350 + ... + 101630.

It is an arithmetic number, because the mean of its divisors is an integer number (1142100).

Almost surely, 2^28518690 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28518690, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36547200).

28518690 is an abundant number, since it is smaller than the sum of its proper divisors (44575710).

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

28518690 is a wasteful number, since it uses less digits than its factorization.

28518690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 507.

The product of its (nonzero) digits is 34560, while the sum is 39.

The square root of 28518690 is about 5340.2893180052. The cubic root of 28518690 is about 305.5224941761.

The spelling of 28518690 in words is "twenty-eight million, five hundred eighteen thousand, six hundred ninety".