16450640 has 20 divisors (see below), whose sum is σ = 38247924. Its totient is φ = 6580224.

The previous prime is 16450631. The next prime is 16450649. The reversal of 16450640 is 4605461.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (16450631) and next prime (16450649).

It can be written as a sum of positive squares in 2 ways, for example, as 4032064 + 12418576 = 2008^2 + 3524^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a hoax number, since the sum of its digits (26) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16450649) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 102737 + ... + 102896.

Almost surely, 2^16450640 is an apocalyptic number.

16450640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

16450640 is an abundant number, since it is smaller than the sum of its proper divisors (21797284).

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

16450640 is a wasteful number, since it uses less digits than its factorization.

16450640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 205646 (or 205640 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 26.

The square root of 16450640 is about 4055.9388555549. The cubic root of 16450640 is about 254.3280527792.

The spelling of 16450640 in words is "sixteen million, four hundred fifty thousand, six hundred forty".