28739538 has 12 divisors (see below), whose sum is σ = 62269038. Its totient is φ = 9579840.

The previous prime is 28739519. The next prime is 28739569. The reversal of 28739538 is 83593782.

28739538 is a `hidden beast` number, since 2 + 87 + 39 + 538 = 666.

It can be written as a sum of positive squares in only one way, i.e., 21594609 + 7144929 = 4647^2 + 2673^2 .

It is a super-2 number, since 2×28739538² = 1651922088906888, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 28739493 and 28739502.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 798303 + ... + 798338.

Almost surely, 2^28739538 is an apocalyptic number.

28739538 is an abundant number, since it is smaller than the sum of its proper divisors (33529500).

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

28739538 is a wasteful number, since it uses less digits than its factorization.

28739538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1596649 (or 1596646 counting only the distinct ones).

The product of its digits is 362880, while the sum is 45.

The square root of 28739538 is about 5360.9269720823. The cubic root of 28739538 is about 306.3091198929.

The spelling of 28739538 in words is "twenty-eight million, seven hundred thirty-nine thousand, five hundred thirty-eight".