672840 has 128 divisors (see below), whose sum is σ = 2592000. Its totient is φ = 152064.

The previous prime is 672827. The next prime is 672863. The reversal of 672840 is 48276.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 672840.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 7516 + ... + 7604.

It is an arithmetic number, because the mean of its divisors is an integer number (20250).

2⁶⁷²⁸⁴⁰ is an apocalyptic number.

672840 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 672840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1296000).

672840 is an abundant number, since it is smaller than the sum of its proper divisors (1919160).

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

672840 is a wasteful number, since it uses less digits than its factorization.

672840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 116 (or 106 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 27.

The square root of 672840 is about 820.2682488064. The cubic root of 672840 is about 87.6268635945.

The spelling of 672840 in words is "six hundred seventy-two thousand, eight hundred forty".