672561 has 6 divisors (see below), whose sum is σ = 971490. Its totient is φ = 448368.

The previous prime is 672557. The next prime is 672577. The reversal of 672561 is 165276.

It can be written as a sum of positive squares in only one way, i.e., 553536 + 119025 = 744^2 + 345^2 .

It is not a de Polignac number, because 672561 - 2² = 672557 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a nialpdrome in base 16.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 672561.

It is not an unprimeable number, because it can be changed into a prime (672521) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 37356 + ... + 37373.

It is an arithmetic number, because the mean of its divisors is an integer number (161915).

2⁶⁷²⁵⁶¹ is an apocalyptic number.

It is an amenable number.

672561 is a deficient number, since it is larger than the sum of its proper divisors (298929).

672561 is a wasteful number, since it uses less digits than its factorization.

672561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74735 (or 74732 counting only the distinct ones).

The product of its digits is 2520, while the sum is 27.

The square root of 672561 is about 820.0981648559. The cubic root of 672561 is about 87.6147501277.

It can be divided in two parts, 6725 and 61, that added together give a triangular number (6786 = T₁₁₆).

The spelling of 672561 in words is "six hundred seventy-two thousand, five hundred sixty-one".