28406667 has 8 divisors (see below), whose sum is σ = 38332224. Its totient is φ = 18709448.

The previous prime is 28406647. The next prime is 28406699. The reversal of 28406667 is 76660482.

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 28406667 - 2¹⁴ = 28390283 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28406647) 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, 56793 + ... + 57290.

It is an arithmetic number, because the mean of its divisors is an integer number (4791528).

Almost surely, 2^28406667 is an apocalyptic number.

28406667 is a deficient number, since it is larger than the sum of its proper divisors (9925557).

28406667 is a wasteful number, since it uses less digits than its factorization.

28406667 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 114169.

The product of its (nonzero) digits is 96768, while the sum is 39.

The square root of 28406667 is about 5329.7905212119. The cubic root of 28406667 is about 305.1219327934.

The spelling of 28406667 in words is "twenty-eight million, four hundred six thousand, six hundred sixty-seven".