28139461 has 8 divisors (see below), whose sum is σ = 32236160. Its totient is φ = 24061968.

The previous prime is 28139459. The next prime is 28139467. The reversal of 28139461 is 16493182.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 28139461 - 2¹ = 28139459 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28139467) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1506 + ... + 7651.

It is an arithmetic number, because the mean of its divisors is an integer number (4029520).

Almost surely, 2^28139461 is an apocalyptic number.

It is an amenable number.

28139461 is a deficient number, since it is larger than the sum of its proper divisors (4096699).

28139461 is an equidigital number, since it uses as much as digits as its factorization.

28139461 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9603.

The product of its digits is 10368, while the sum is 34.

The square root of 28139461 is about 5304.6640798452. The cubic root of 28139461 is about 304.1622121655.

The spelling of 28139461 in words is "twenty-eight million, one hundred thirty-nine thousand, four hundred sixty-one".