16545640 has 32 divisors (see below), whose sum is σ = 37843560. Its totient is φ = 6508800.

The previous prime is 16545629. The next prime is 16545643. The reversal of 16545640 is 4654561.

It can be written as a sum of positive squares in 4 ways, for example, as 8054244 + 8491396 = 2838^2 + 2914^2 .

It is not an unprimeable number, because it can be changed into a prime (16545643) 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, 951 + ... + 5830.

Almost surely, 2^16545640 is an apocalyptic number.

16545640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

16545640 is an abundant number, since it is smaller than the sum of its proper divisors (21297920).

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

16545640 is a wasteful number, since it uses less digits than its factorization.

16545640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6853 (or 6849 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 31.

The square root of 16545640 is about 4067.6332184699. The cubic root of 16545640 is about 254.8166822916.

The spelling of 16545640 in words is "sixteen million, five hundred forty-five thousand, six hundred forty".