28730631 has 4 divisors (see below), whose sum is σ = 38307512. Its totient is φ = 19153752.

The previous prime is 28730623. The next prime is 28730633. The reversal of 28730631 is 13603782.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 28730631 - 2³ = 28730623 is a prime.

It is a super-2 number, since 2×28730631² = 1650898315316322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28730633) 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 3 ways as a sum of consecutive naturals, for example, 4788436 + ... + 4788441.

It is an arithmetic number, because the mean of its divisors is an integer number (9576878).

Almost surely, 2^28730631 is an apocalyptic number.

28730631 is a deficient number, since it is larger than the sum of its proper divisors (9576881).

28730631 is an equidigital number, since it uses as much as digits as its factorization.

28730631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9576880.

The product of its (nonzero) digits is 6048, while the sum is 30.

The square root of 28730631 is about 5360.0961745103. The cubic root of 28730631 is about 306.2774726986.

The spelling of 28730631 in words is "twenty-eight million, seven hundred thirty thousand, six hundred thirty-one".