661472 has 24 divisors (see below), whose sum is σ = 1488816. Its totient is φ = 283392.

The previous prime is 661459. The next prime is 661477. The reversal of 661472 is 274166.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (661477) by changing a digit.

661472 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1253 + ... + 1700.

It is an arithmetic number, because the mean of its divisors is an integer number (62034).

2⁶⁶¹⁴⁷² is an apocalyptic number.

It is an amenable number.

661472 is an abundant number, since it is smaller than the sum of its proper divisors (827344).

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

661472 is a wasteful number, since it uses less digits than its factorization.

661472 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2970 (or 2962 counting only the distinct ones).

The product of its digits is 2016, while the sum is 26.

The square root of 661472 is about 813.3092892621. The cubic root of 661472 is about 87.1305566135.

The spelling of 661472 in words is "six hundred sixty-one thousand, four hundred seventy-two".