672420 has 48 divisors (see below), whose sum is σ = 2153088. Its totient is φ = 153600.

The previous prime is 672379. The next prime is 672439. The reversal of 672420 is 24276.

672420 = T₁₇₅ + T₁₇₆ + ... + T₂₁₀.

It is a happy number.

672420 is an esthetic number in base 9, because in such base its adjacent digits differ by 1.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is an unprimeable number.

672420 is an untouchable number, because it is not equal to the sum of proper divisors of any 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 15 ways as a sum of consecutive naturals, for example, 381 + ... + 1220.

It is an arithmetic number, because the mean of its divisors is an integer number (44856).

2⁶⁷²⁴²⁰ is an apocalyptic number.

672420 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

672420 is an abundant number, since it is smaller than the sum of its proper divisors (1480668).

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

672420 is a wasteful number, since it uses less digits than its factorization.

672420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1620 (or 1618 counting only the distinct ones).

The product of its (nonzero) digits is 672, while the sum is 21.

The square root of 672420 is about 820.0121950313. The cubic root of 672420 is about 87.6086269938.

Adding to 672420 its reverse (24276), we get a palindrome (696696).

The spelling of 672420 in words is "six hundred seventy-two thousand, four hundred twenty".