28472691 has 8 divisors (see below), whose sum is σ = 40883920. Its totient is φ = 17521632.

The previous prime is 28472681. The next prime is 28472707. The reversal of 28472691 is 19627482.

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

It is a de Polignac number, because none of the positive numbers 2^k-28472691 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39), and also a Moran number because the ratio is a prime number: 730069 = 28472691 / (2 + 8 + 4 + 7 + 2 + 6 + 9 + 1).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28472681) 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, 364996 + ... + 365073.

It is an arithmetic number, because the mean of its divisors is an integer number (5110490).

Almost surely, 2^28472691 is an apocalyptic number.

28472691 is a deficient number, since it is larger than the sum of its proper divisors (12411229).

28472691 is a wasteful number, since it uses less digits than its factorization.

28472691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 730085.

The product of its digits is 48384, while the sum is 39.

The square root of 28472691 is about 5335.9807908200. The cubic root of 28472691 is about 305.3581424015.

The spelling of 28472691 in words is "twenty-eight million, four hundred seventy-two thousand, six hundred ninety-one".