28811402 has 4 divisors (see below), whose sum is σ = 43217106. Its totient is φ = 14405700.

The previous prime is 28811401. The next prime is 28811441. The reversal of 28811402 is 20411882.

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., 20349121 + 8462281 = 4511^2 + 2909^2 .

It is not an unprimeable number, because it can be changed into a prime (28811401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7202849 + ... + 7202852.

Almost surely, 2^28811402 is an apocalyptic number.

28811402 is a deficient number, since it is larger than the sum of its proper divisors (14405704).

28811402 is a wasteful number, since it uses less digits than its factorization.

28811402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14405703.

The product of its (nonzero) digits is 1024, while the sum is 26.

The square root of 28811402 is about 5367.6253595049. The cubic root of 28811402 is about 306.5642188247.

The spelling of 28811402 in words is "twenty-eight million, eight hundred eleven thousand, four hundred two".