28030557 has 8 divisors (see below), whose sum is σ = 37422784. Its totient is φ = 18662688.

The previous prime is 28030553. The next prime is 28030591. The reversal of 28030557 is 75503082.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 28030557 - 2² = 28030553 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28030553) 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, 3208 + ... + 8145.

It is an arithmetic number, because the mean of its divisors is an integer number (4677848).

Almost surely, 2^28030557 is an apocalyptic number.

It is an amenable number.

28030557 is a deficient number, since it is larger than the sum of its proper divisors (9392227).

28030557 is a wasteful number, since it uses less digits than its factorization.

28030557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12179.

The product of its (nonzero) digits is 8400, while the sum is 30.

The square root of 28030557 is about 5294.3891998983. The cubic root of 28030557 is about 303.7693201821.

The spelling of 28030557 in words is "twenty-eight million, thirty thousand, five hundred fifty-seven".