28390542 has 16 divisors (see below), whose sum is σ = 57367632. Its totient is φ = 9365760.

The previous prime is 28390519. The next prime is 28390543. The reversal of 28390542 is 24509382.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28390543) 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, 23809 + ... + 24972.

It is an arithmetic number, because the mean of its divisors is an integer number (3585477).

Almost surely, 2^28390542 is an apocalyptic number.

28390542 is an abundant number, since it is smaller than the sum of its proper divisors (28977090).

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

28390542 is a wasteful number, since it uses less digits than its factorization.

28390542 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48883.

The product of its (nonzero) digits is 17280, while the sum is 33.

The square root of 28390542 is about 5328.2775828592. The cubic root of 28390542 is about 305.0641878701.

The spelling of 28390542 in words is "twenty-eight million, three hundred ninety thousand, five hundred forty-two".