672540 has 48 divisors (see below), whose sum is σ = 2056320. Its totient is φ = 162880.

The previous prime is 672521. The next prime is 672557. The reversal of 672540 is 45276.

It is a happy number.

It is a nialpdrome in base 15.

It is a self number, because there is not a number n which added to its sum of digits gives 672540.

It is a congruent number.

It is an unprimeable number.

672540 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 15 ways as a sum of consecutive naturals, for example, 151 + ... + 1169.

It is an arithmetic number, because the mean of its divisors is an integer number (42840).

2⁶⁷²⁵⁴⁰ is an apocalyptic number.

672540 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 672540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1028160).

672540 is an abundant number, since it is smaller than the sum of its proper divisors (1383780).

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

672540 is a wasteful number, since it uses less digits than its factorization.

672540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1042 (or 1040 counting only the distinct ones).

The product of its (nonzero) digits is 1680, while the sum is 24.

The square root of 672540 is about 820.0853614106. The cubic root of 672540 is about 87.6138382259.

Subtracting from 672540 its reverse (45276), we obtain a square (627264 = 792²).

The spelling of 672540 in words is "six hundred seventy-two thousand, five hundred forty".