28440342 has 32 divisors (see below), whose sum is σ = 72230400. Its totient is φ = 8125704.

The previous prime is 28440341. The next prime is 28440353. The reversal of 28440342 is 24304482.

It is a happy number.

28440342 is a `hidden beast` number, since 284 + 40 + 342 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28440341) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 37242 + ... + 37997.

It is an arithmetic number, because the mean of its divisors is an integer number (2257200).

Almost surely, 2^28440342 is an apocalyptic number.

28440342 is an abundant number, since it is smaller than the sum of its proper divisors (43790058).

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

28440342 is a wasteful number, since it uses less digits than its factorization.

28440342 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75257 (or 75251 counting only the distinct ones).

The product of its (nonzero) digits is 6144, while the sum is 27.

The square root of 28440342 is about 5332.9487152981. The cubic root of 28440342 is about 305.2424552464.

It can be divided in two parts, 28440 and 342, that added together give a palindrome (28782).

The spelling of 28440342 in words is "twenty-eight million, four hundred forty thousand, three hundred forty-two".