28139962 has 4 divisors (see below), whose sum is σ = 42209946. Its totient is φ = 14069980.

The previous prime is 28139957. The next prime is 28139963. The reversal of 28139962 is 26993182.

It is a happy number.

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

It can be written as a sum of positive squares in only one way, i.e., 27888961 + 251001 = 5281^2 + 501^2 .

It is a super-2 number, since 2×28139962² = 1583714922722888, which contains 22 as substring.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (28139963) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7034989 + ... + 7034992.

Almost surely, 2^28139962 is an apocalyptic number.

28139962 is a deficient number, since it is larger than the sum of its proper divisors (14069984).

28139962 is a wasteful number, since it uses less digits than its factorization.

28139962 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14069983.

The product of its digits is 46656, while the sum is 40.

The square root of 28139962 is about 5304.7113022294. The cubic root of 28139962 is about 304.1640172743.

The spelling of 28139962 in words is "twenty-eight million, one hundred thirty-nine thousand, nine hundred sixty-two".