28901559 has 4 divisors (see below), whose sum is σ = 38535416. Its totient is φ = 19267704.

The previous prime is 28901549. The next prime is 28901573. The reversal of 28901559 is 95510982.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 28901559 - 2¹¹ = 28899511 is a prime.

It is a super-2 number, since 2×28901559² = 1670600225260962, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28901549) 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, 4816924 + ... + 4816929.

It is an arithmetic number, because the mean of its divisors is an integer number (9633854).

Almost surely, 2^28901559 is an apocalyptic number.

28901559 is a deficient number, since it is larger than the sum of its proper divisors (9633857).

28901559 is an equidigital number, since it uses as much as digits as its factorization.

28901559 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9633856.

The product of its (nonzero) digits is 32400, while the sum is 39.

The square root of 28901559 is about 5376.0170200623. The cubic root of 28901559 is about 306.8836540602.

The spelling of 28901559 in words is "twenty-eight million, nine hundred one thousand, five hundred fifty-nine".