16721264 has 20 divisors (see below), whose sum is σ = 37025904. Its totient is φ = 7166208.

The previous prime is 16721239. The next prime is 16721267. The reversal of 16721264 is 46212761.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16721267) 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, 74537 + ... + 74760.

Almost surely, 2^16721264 is an apocalyptic number.

16721264 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

16721264 is an abundant number, since it is smaller than the sum of its proper divisors (20304640).

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

16721264 is a wasteful number, since it uses less digits than its factorization.

16721264 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 149312 (or 149306 counting only the distinct ones).

The product of its digits is 4032, while the sum is 29.

The square root of 16721264 is about 4089.1642177834. The cubic root of 16721264 is about 255.7150964587.

The spelling of 16721264 in words is "sixteen million, seven hundred twenty-one thousand, two hundred sixty-four".