28472731 has 8 divisors (see below), whose sum is σ = 32591840. Its totient is φ = 24366528.

The previous prime is 28472707. The next prime is 28472747. The reversal of 28472731 is 13727482.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 28472731 - 2⁹ = 28472219 is a prime.

It is a super-2 number, since 2×28472731² = 1621392821196722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28472771) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2095 + ... + 7831.

It is an arithmetic number, because the mean of its divisors is an integer number (4073980).

Almost surely, 2^28472731 is an apocalyptic number.

28472731 is a deficient number, since it is larger than the sum of its proper divisors (4119109).

28472731 is an equidigital number, since it uses as much as digits as its factorization.

28472731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6453.

The product of its digits is 18816, while the sum is 34.

The square root of 28472731 is about 5335.9845389581. The cubic root of 28472731 is about 305.3582853960.

The spelling of 28472731 in words is "twenty-eight million, four hundred seventy-two thousand, seven hundred thirty-one".