28311142 has 8 divisors (see below), whose sum is σ = 43614576. Its totient is φ = 13772952.

The previous prime is 28311119. The next prime is 28311149. The reversal of 28311142 is 24111382.

It is a happy number.

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

It is a super-2 number, since 2×28311142² = 1603041522688328, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28311149) 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, 191218 + ... + 191365.

It is an arithmetic number, because the mean of its divisors is an integer number (5451822).

Almost surely, 2^28311142 is an apocalyptic number.

28311142 is a deficient number, since it is larger than the sum of its proper divisors (15303434).

28311142 is a wasteful number, since it uses less digits than its factorization.

28311142 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 382622.

The product of its digits is 384, while the sum is 22.

The square root of 28311142 is about 5320.8215531062. The cubic root of 28311142 is about 304.7795307196.

The spelling of 28311142 in words is "twenty-eight million, three hundred eleven thousand, one hundred forty-two".