28861428 has 24 divisors (see below), whose sum is σ = 68910688. Its totient is φ = 9396576.

The previous prime is 28861381. The next prime is 28861439. The reversal of 28861428 is 82416882.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27451 + ... + 28482.

Almost surely, 2^28861428 is an apocalyptic number.

It is an amenable number.

28861428 is an abundant number, since it is smaller than the sum of its proper divisors (40049260).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28861428 is a wasteful number, since it uses less digits than its factorization.

28861428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55983 (or 55981 counting only the distinct ones).

The product of its digits is 49152, while the sum is 39.

The square root of 28861428 is about 5372.2833134525. The cubic root of 28861428 is about 306.7415480867.

It can be divided in two parts, 288 and 61428, that added together give a palindrome (61716).

The spelling of 28861428 in words is "twenty-eight million, eight hundred sixty-one thousand, four hundred twenty-eight".