16500640 has 48 divisors (see below), whose sum is σ = 41986728. Its totient is φ = 6091776.

The previous prime is 16500593. The next prime is 16500641. The reversal of 16500640 is 4600561.

It can be written as a sum of positive squares in 4 ways, for example, as 8503056 + 7997584 = 2916^2 + 2828^2 .

It is a super-2 number, since 2×16500640² = 544542240819200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16500641) 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, 1887 + ... + 6046.

Almost surely, 2^16500640 is an apocalyptic number.

16500640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

16500640 is an abundant number, since it is smaller than the sum of its proper divisors (25486088).

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

16500640 is a wasteful number, since it uses less digits than its factorization.

16500640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7961 (or 7953 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 22.

The square root of 16500640 is about 4062.0979801083. The cubic root of 16500640 is about 254.5854600078.

The spelling of 16500640 in words is "sixteen million, five hundred thousand, six hundred forty".