28613691 has 24 divisors (see below), whose sum is σ = 43926480. Its totient is φ = 17914176.

The previous prime is 28613671. The next prime is 28613707. The reversal of 28613691 is 19631682.

It is not a de Polignac number, because 28613691 - 2¹⁴ = 28597307 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28613621) 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, 8176 + ... + 11138.

It is an arithmetic number, because the mean of its divisors is an integer number (1830270).

Almost surely, 2^28613691 is an apocalyptic number.

28613691 is a deficient number, since it is larger than the sum of its proper divisors (15312789).

28613691 is a wasteful number, since it uses less digits than its factorization.

28613691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3035 (or 3032 counting only the distinct ones).

The product of its digits is 15552, while the sum is 36.

The square root of 28613691 is about 5349.1766656187. The cubic root of 28613691 is about 305.8613687042.

Subtracting from 28613691 its reverse (19631682), we obtain a square (8982009 = 2997²).

The spelling of 28613691 in words is "twenty-eight million, six hundred thirteen thousand, six hundred ninety-one".