16280640 has 84 divisors (see below), whose sum is σ = 56008524. Its totient is φ = 4340736.

The previous prime is 16280623. The next prime is 16280657. The reversal of 16280640 is 4608261.

16280640 is a `hidden beast` number, since 16 + 2 + 8 + 0 + 640 = 666.

It is an interprime number because it is at equal distance from previous prime (16280623) and next prime (16280657).

It can be written as a sum of positive squares in 2 ways, for example, as 9437184 + 6843456 = 3072^2 + 2616^2 .

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, 54 + ... + 5706.

Almost surely, 2^16280640 is an apocalyptic number.

16280640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 16280640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28004262).

16280640 is an abundant number, since it is smaller than the sum of its proper divisors (39727884).

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

16280640 is a wasteful number, since it uses less digits than its factorization.

16280640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5676 (or 5663 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 27.

The square root of 16280640 is about 4034.9275086425. The cubic root of 16280640 is about 253.4489469217.

The spelling of 16280640 in words is "sixteen million, two hundred eighty thousand, six hundred forty".