28430537 has 4 divisors (see below), whose sum is σ = 28647696. Its totient is φ = 28213380.

The previous prime is 28430513. The next prime is 28430539. The reversal of 28430537 is 73503482.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 28430537 - 2¹² = 28426441 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28430539) 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, 108383 + ... + 108644.

It is an arithmetic number, because the mean of its divisors is an integer number (7161924).

Almost surely, 2^28430537 is an apocalyptic number.

It is an amenable number.

28430537 is a deficient number, since it is larger than the sum of its proper divisors (217159).

28430537 is a wasteful number, since it uses less digits than its factorization.

28430537 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 217158.

The product of its (nonzero) digits is 20160, while the sum is 32.

The square root of 28430537 is about 5332.0293510070. The cubic root of 28430537 is about 305.2073730818.

The spelling of 28430537 in words is "twenty-eight million, four hundred thirty thousand, five hundred thirty-seven".