28291016 has 16 divisors (see below), whose sum is σ = 57126300. Its totient is φ = 13057344.

The previous prime is 28291013. The next prime is 28291063. The reversal of 28291016 is 61019282.

It can be written as a sum of positive squares in 2 ways, for example, as 27984100 + 306916 = 5290^2 + 554^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 28291016.

It is not an unprimeable number, because it can be changed into a prime (28291013) 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, 135911 + ... + 136118.

Almost surely, 2^28291016 is an apocalyptic number.

28291016 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

28291016 is an abundant number, since it is smaller than the sum of its proper divisors (28835284).

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

28291016 is a wasteful number, since it uses less digits than its factorization.

28291016 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 272048 (or 272044 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 29.

The square root of 28291016 is about 5318.9299675781. The cubic root of 28291016 is about 304.7072924123.

The spelling of 28291016 in words is "twenty-eight million, two hundred ninety-one thousand, sixteen".