28142390 has 16 divisors (see below), whose sum is σ = 50824800. Its totient is φ = 11219520.

The previous prime is 28142353. The next prime is 28142393. The reversal of 28142390 is 9324182.

It is a super-2 number, since 2×28142390² = 1583988229824200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28142393) 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, 1415 + ... + 7634.

It is an arithmetic number, because the mean of its divisors is an integer number (3176550).

Almost surely, 2^28142390 is an apocalyptic number.

28142390 is a deficient number, since it is larger than the sum of its proper divisors (22682410).

28142390 is a wasteful number, since it uses less digits than its factorization.

28142390 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9367.

The product of its (nonzero) digits is 3456, while the sum is 29.

The square root of 28142390 is about 5304.9401504635. The cubic root of 28142390 is about 304.1727650828.

The spelling of 28142390 in words is "twenty-eight million, one hundred forty-two thousand, three hundred ninety".