16427640 has 32 divisors (see below), whose sum is σ = 49283280. Its totient is φ = 4380672.

The previous prime is 16427639. The next prime is 16427687. The reversal of 16427640 is 4672461.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 16427598 and 16427607.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 68329 + ... + 68568.

Almost surely, 2^16427640 is an apocalyptic number.

16427640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

16427640 is an abundant number, since it is smaller than the sum of its proper divisors (32855640).

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

16427640 is a wasteful number, since it uses less digits than its factorization.

16427640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 136911 (or 136907 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 30.

The square root of 16427640 is about 4053.1025153578. The cubic root of 16427640 is about 254.2094702912.

The spelling of 16427640 in words is "sixteen million, four hundred twenty-seven thousand, six hundred forty".