28140402 has 16 divisors (see below), whose sum is σ = 57121632. Its totient is φ = 9240000.

The previous prime is 28140401. The next prime is 28140419. The reversal of 28140402 is 20404182.

It is not an unprimeable number, because it can be changed into a prime (28140401) 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, 34599 + ... + 35402.

It is an arithmetic number, because the mean of its divisors is an integer number (3570102).

Almost surely, 2^28140402 is an apocalyptic number.

28140402 is an abundant number, since it is smaller than the sum of its proper divisors (28981230).

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

28140402 is a wasteful number, since it uses less digits than its factorization.

28140402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70073.

The product of its (nonzero) digits is 512, while the sum is 21.

The square root of 28140402 is about 5304.7527746352. The cubic root of 28140402 is about 304.1656025817.

Adding to 28140402 its reverse (20404182), we get a palindrome (48544584).

The spelling of 28140402 in words is "twenty-eight million, one hundred forty thousand, four hundred two".