28478671 has 8 divisors (see below), whose sum is σ = 30720704. Its totient is φ = 26244000.

The previous prime is 28478657. The next prime is 28478683. The reversal of 28478671 is 17687482.

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

It is a 8-Lehmer number, since φ(28478671) divides (28478671-1)⁸.

It is a cyclic number.

It is not a de Polignac number, because 28478671 - 2⁹ = 28478159 is a prime.

It is a super-2 number, since 2×28478671² = 1622069403852482, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28478971) 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, 8305 + ... + 11221.

It is an arithmetic number, because the mean of its divisors is an integer number (3840088).

Almost surely, 2^28478671 is an apocalyptic number.

28478671 is a deficient number, since it is larger than the sum of its proper divisors (2242033).

28478671 is a wasteful number, since it uses less digits than its factorization.

28478671 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3681.

The product of its digits is 150528, while the sum is 43.

The square root of 28478671 is about 5336.5411082461. The cubic root of 28478671 is about 305.3795186021.

The spelling of 28478671 in words is "twenty-eight million, four hundred seventy-eight thousand, six hundred seventy-one".