28732690 has 32 divisors (see below), whose sum is σ = 59552640. Its totient is φ = 9777024.

The previous prime is 28732687. The next prime is 28732699. The reversal of 28732690 is 9623782.

It is a super-2 number, since 2×28732690² = 1651134949272200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (28732699) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8254 + ... + 11206.

It is an arithmetic number, because the mean of its divisors is an integer number (1861020).

Almost surely, 2^28732690 is an apocalyptic number.

28732690 is an abundant number, since it is smaller than the sum of its proper divisors (30819950).

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

28732690 is a wasteful number, since it uses less digits than its factorization.

28732690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3106.

The product of its (nonzero) digits is 36288, while the sum is 37.

The square root of 28732690 is about 5360.2882385185. The cubic root of 28732690 is about 306.2847890508.

The spelling of 28732690 in words is "twenty-eight million, seven hundred thirty-two thousand, six hundred ninety".