28662731 has 18 divisors (see below), whose sum is σ = 31737660. Its totient is φ = 25872640.

The previous prime is 28662719. The next prime is 28662763. The reversal of 28662731 is 13726682.

It is a happy number.

It is not a de Polignac number, because 28662731 - 2¹⁴ = 28646347 is a prime.

It is a super-2 number, since 2×28662731² = 1643104296756722, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28662691 and 28662700.

It is not an unprimeable number, because it can be changed into a prime (28662791) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 485780 + ... + 485838.

Almost surely, 2^28662731 is an apocalyptic number.

28662731 is a deficient number, since it is larger than the sum of its proper divisors (3074929).

28662731 is an equidigital number, since it uses as much as digits as its factorization.

28662731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 175 (or 117 counting only the distinct ones).

The product of its digits is 24192, while the sum is 35.

The square root of 28662731 is about 5353.7585862644. The cubic root of 28662731 is about 306.0360039941.

The spelling of 28662731 in words is "twenty-eight million, six hundred sixty-two thousand, seven hundred thirty-one".