28647431 has 8 divisors (see below), whose sum is σ = 30618000. Its totient is φ = 26708608.

The previous prime is 28647427. The next prime is 28647467. The reversal of 28647431 is 13474682.

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 28647431 - 2² = 28647427 is a prime.

It is a super-2 number, since 2×28647431² = 1641350605799522, 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 = 28647391 and 28647400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28647631) 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, 6056 + ... + 9693.

It is an arithmetic number, because the mean of its divisors is an integer number (3827250).

Almost surely, 2^28647431 is an apocalyptic number.

28647431 is a deficient number, since it is larger than the sum of its proper divisors (1970569).

28647431 is a wasteful number, since it uses less digits than its factorization.

28647431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15873.

The product of its digits is 32256, while the sum is 35.

The square root of 28647431 is about 5352.3294928470. The cubic root of 28647431 is about 305.9815408860.

The spelling of 28647431 in words is "twenty-eight million, six hundred forty-seven thousand, four hundred thirty-one".