16671572 has 6 divisors (see below), whose sum is σ = 29175258. Its totient is φ = 8335784.

The previous prime is 16671559. The next prime is 16671631. The reversal of 16671572 is 27517661.

It can be written as a sum of positive squares in only one way, i.e., 12931216 + 3740356 = 3596^2 + 1934^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2083943 + ... + 2083950.

It is an arithmetic number, because the mean of its divisors is an integer number (4862543).

Almost surely, 2^16671572 is an apocalyptic number.

16671572 is the 2183-rd centered heptagonal number.

It is an amenable number.

16671572 is a deficient number, since it is larger than the sum of its proper divisors (12503686).

16671572 is a wasteful number, since it uses less digits than its factorization.

16671572 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4167897 (or 4167895 counting only the distinct ones).

The product of its digits is 17640, while the sum is 35.

The square root of 16671572 is about 4083.0836386241. The cubic root of 16671572 is about 255.4615350277.

The spelling of 16671572 in words is "sixteen million, six hundred seventy-one thousand, five hundred seventy-two".