28139616 has 48 divisors (see below), whose sum is σ = 82076400. Its totient is φ = 9379584.

The previous prime is 28139597. The next prime is 28139633. The reversal of 28139616 is 61693182.

28139616 is a `hidden beast` number, since 2 + 8 + 1 + 39 + 616 = 666.

It is a tau number, because it is divible by the number of its divisors (48).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a nude number because it is divisible by every one of its digits.

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, 15421 + ... + 17148.

It is an arithmetic number, because the mean of its divisors is an integer number (1709925).

Almost surely, 2^28139616 is an apocalyptic number.

It is an amenable number.

28139616 is an abundant number, since it is smaller than the sum of its proper divisors (53936784).

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

28139616 is a wasteful number, since it uses less digits than its factorization.

28139616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32588 (or 32574 counting only the distinct ones).

The product of its digits is 15552, while the sum is 36.

The square root of 28139616 is about 5304.6786896098. The cubic root of 28139616 is about 304.1627706346.

The spelling of 28139616 in words is "twenty-eight million, one hundred thirty-nine thousand, six hundred sixteen".