28013402 has 8 divisors (see below), whose sum is σ = 43847136. Its totient is φ = 13397692.

The previous prime is 28013393. The next prime is 28013407. The reversal of 28013402 is 20431082.

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

It is a super-2 number, since 2×28013402² = 1569501383227208, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (28013407) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 304448 + ... + 304539.

It is an arithmetic number, because the mean of its divisors is an integer number (5480892).

Almost surely, 2^28013402 is an apocalyptic number.

28013402 is a deficient number, since it is larger than the sum of its proper divisors (15833734).

28013402 is a wasteful number, since it uses less digits than its factorization.

28013402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 609012.

The product of its (nonzero) digits is 384, while the sum is 20.

The square root of 28013402 is about 5292.7688405975. The cubic root of 28013402 is about 303.7073375139.

Adding to 28013402 its reverse (20431082), we get a palindrome (48444484).

The spelling of 28013402 in words is "twenty-eight million, thirteen thousand, four hundred two".