16312640 has 56 divisors (see below), whose sum is σ = 40904160. Its totient is φ = 6179328.

The previous prime is 16312633. The next prime is 16312643. The reversal of 16312640 is 4621361.

It is a happy number.

It is a super-2 number, since 2×16312640² = 532204447539200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16312643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4739 + ... + 7421.

Almost surely, 2^16312640 is an apocalyptic number.

16312640 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 16312640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20452080).

16312640 is an abundant number, since it is smaller than the sum of its proper divisors (24591520).

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

16312640 is a wasteful number, since it uses less digits than its factorization.

16312640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2719 (or 2709 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 23.

The square root of 16312640 is about 4038.8909368786. The cubic root of 16312640 is about 253.6148916345.

The spelling of 16312640 in words is "sixteen million, three hundred twelve thousand, six hundred forty".