28518516 has 36 divisors (see below), whose sum is σ = 77635012. Its totient is φ = 8774784.

The previous prime is 28518509. The next prime is 28518521. The reversal of 28518516 is 61581582.

It can be written as a sum of positive squares in 2 ways, for example, as 4016016 + 24502500 = 2004^2 + 4950^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 30001 + ... + 30936.

Almost surely, 2^28518516 is an apocalyptic number.

28518516 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

28518516 is an abundant number, since it is smaller than the sum of its proper divisors (49116496).

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

28518516 is a wasteful number, since it uses less digits than its factorization.

28518516 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60960 (or 60955 counting only the distinct ones).

The product of its digits is 19200, while the sum is 36.

The square root of 28518516 is about 5340.2730267281. The cubic root of 28518516 is about 305.5218728173.

The spelling of 28518516 in words is "twenty-eight million, five hundred eighteen thousand, five hundred sixteen".