6651972 has 18 divisors (see below), whose sum is σ = 16814798. Its totient is φ = 2217312.

The previous prime is 6651959. The next prime is 6652001. The reversal of 6651972 is 2791566.

It can be written as a sum of positive squares in only one way, i.e., 6320196 + 331776 = 2514^2 + 576^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 184777 = 6651972 / (6 + 6 + 5 + 1 + 9 + 7 + 2).

It is an Ulam number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 92353 + ... + 92424.

Almost surely, 2^6651972 is an apocalyptic number.

It is an amenable number.

6651972 is an abundant number, since it is smaller than the sum of its proper divisors (10162826).

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

6651972 is a wasteful number, since it uses less digits than its factorization.

6651972 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 184787 (or 184782 counting only the distinct ones).

The product of its digits is 22680, while the sum is 36.

The square root of 6651972 is about 2579.1417177038. The cubic root of 6651972 is about 188.0688219435.

The spelling of 6651972 in words is "six million, six hundred fifty-one thousand, nine hundred seventy-two".