16513640 has 64 divisors (see below), whose sum is σ = 43666560. Its totient is φ = 5541120.

The previous prime is 16513639. The next prime is 16513643. The reversal of 16513640 is 4631561.

It is a Harshad number since it is a multiple of its sum of digits (26).

It is not an unprimeable number, because it can be changed into a prime (16513643) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4277 + ... + 7163.

It is an arithmetic number, because the mean of its divisors is an integer number (682290).

Almost surely, 2^16513640 is an apocalyptic number.

16513640 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 16513640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21833280).

16513640 is an abundant number, since it is smaller than the sum of its proper divisors (27152920).

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

16513640 is a wasteful number, since it uses less digits than its factorization.

16513640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2922 (or 2918 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 26.

The square root of 16513640 is about 4063.6978234116. The cubic root of 16513640 is about 254.6523006921.

The spelling of 16513640 in words is "sixteen million, five hundred thirteen thousand, six hundred forty".