28011402 has 12 divisors (see below), whose sum is σ = 60691410. Its totient is φ = 9337128.

The previous prime is 28011397. The next prime is 28011433. The reversal of 28011402 is 20411082.

It can be written as a sum of positive squares in only one way, i.e., 21706281 + 6305121 = 4659^2 + 2511^2 .

It is a Harshad number since it is a multiple of its sum of digits (18), and also a Moran number because the ratio is a prime number: 1556189 = 28011402 / (2 + 8 + 0 + 1 + 1 + 4 + 0 + 2).

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, 778077 + ... + 778112.

Almost surely, 2^28011402 is an apocalyptic number.

28011402 is an abundant number, since it is smaller than the sum of its proper divisors (32680008).

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

28011402 is a wasteful number, since it uses less digits than its factorization.

28011402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1556197 (or 1556194 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

The square root of 28011402 is about 5292.5799001999. The cubic root of 28011402 is about 303.7001096743.

Adding to 28011402 its reverse (20411082), we get a palindrome (48422484).

The spelling of 28011402 in words is "twenty-eight million, eleven thousand, four hundred two".