28373731 has 6 divisors (see below), whose sum is σ = 30141260. Its totient is φ = 26704416.

The previous prime is 28373729. The next prime is 28373753. The reversal of 28373731 is 13737382.

It is not a de Polignac number, because 28373731 - 2¹ = 28373729 is a prime.

It is a super-2 number, since 2×28373731² = 1610137221720722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28373701) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 48801 + ... + 49378.

Almost surely, 2^28373731 is an apocalyptic number.

28373731 is a deficient number, since it is larger than the sum of its proper divisors (1767529).

28373731 is an equidigital number, since it uses as much as digits as its factorization.

28373731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 98213 (or 98196 counting only the distinct ones).

The product of its digits is 21168, while the sum is 34.

The square root of 28373731 is about 5326.6998225918. The cubic root of 28373731 is about 305.0039630409.

The spelling of 28373731 in words is "twenty-eight million, three hundred seventy-three thousand, seven hundred thirty-one".