28661894 has 4 divisors (see below), whose sum is σ = 42992844. Its totient is φ = 14330946.

The previous prime is 28661891. The next prime is 28661903. The reversal of 28661894 is 49816682.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28661891) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7165472 + ... + 7165475.

It is an arithmetic number, because the mean of its divisors is an integer number (10748211).

Almost surely, 2^28661894 is an apocalyptic number.

28661894 is a deficient number, since it is larger than the sum of its proper divisors (14330950).

28661894 is a wasteful number, since it uses less digits than its factorization.

28661894 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14330949.

The product of its digits is 165888, while the sum is 44.

The square root of 28661894 is about 5353.6804163118. The cubic root of 28661894 is about 306.0330250429.

The spelling of 28661894 in words is "twenty-eight million, six hundred sixty-one thousand, eight hundred ninety-four".