28542501 has 12 divisors (see below), whose sum is σ = 44399628. Its totient is φ = 17564544.

The previous prime is 28542491. The next prime is 28542509. The reversal of 28542501 is 10524582.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 9828225 + 18714276 = 3135^2 + 4326^2 .

It is not a de Polignac number, because 28542501 - 2⁷ = 28542373 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28542509) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 121860 + ... + 122093.

It is an arithmetic number, because the mean of its divisors is an integer number (3699969).

Almost surely, 2^28542501 is an apocalyptic number.

It is an amenable number.

28542501 is a deficient number, since it is larger than the sum of its proper divisors (15857127).

28542501 is a wasteful number, since it uses less digits than its factorization.

28542501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 243972 (or 243969 counting only the distinct ones).

The product of its (nonzero) digits is 3200, while the sum is 27.

The square root of 28542501 is about 5342.5182264546. The cubic root of 28542501 is about 305.6075000958.

The spelling of 28542501 in words is "twenty-eight million, five hundred forty-two thousand, five hundred one".