28418661 has 32 divisors (see below), whose sum is σ = 45772800. Its totient is φ = 17359920.

The previous prime is 28418659. The next prime is 28418669. The reversal of 28418661 is 16681482.

It is not a de Polignac number, because 28418661 - 2¹ = 28418659 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28418669) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 15010 + ... + 16796.

It is an arithmetic number, because the mean of its divisors is an integer number (1430400).

Almost surely, 2^28418661 is an apocalyptic number.

It is an amenable number.

28418661 is a deficient number, since it is larger than the sum of its proper divisors (17354139).

28418661 is a wasteful number, since it uses less digits than its factorization.

28418661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1846 (or 1840 counting only the distinct ones).

The product of its digits is 18432, while the sum is 36.

The square root of 28418661 is about 5330.9155874015. The cubic root of 28418661 is about 305.1648701025.

The spelling of 28418661 in words is "twenty-eight million, four hundred eighteen thousand, six hundred sixty-one".