28473731 has 16 divisors (see below), whose sum is σ = 33868800. Its totient is φ = 23596320.

The previous prime is 28473713. The next prime is 28473787. The reversal of 28473731 is 13737482.

It is not a de Polignac number, because 28473731 - 2¹⁰ = 28472707 is a prime.

It is a super-2 number, since 2×28473731² = 1621506714120722, 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 = 28473691 and 28473700.

It is not an unprimeable number, because it can be changed into a prime (28473791) 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, 10670 + ... + 13068.

It is an arithmetic number, because the mean of its divisors is an integer number (2116800).

Almost surely, 2^28473731 is an apocalyptic number.

28473731 is a deficient number, since it is larger than the sum of its proper divisors (5395069).

28473731 is a wasteful number, since it uses less digits than its factorization.

28473731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2506.

The product of its digits is 28224, while the sum is 35.

The square root of 28473731 is about 5336.0782415553. The cubic root of 28473731 is about 305.3618602166.

The spelling of 28473731 in words is "twenty-eight million, four hundred seventy-three thousand, seven hundred thirty-one".