672278389 has 4 divisors (see below), whose sum is σ = 681487756. Its totient is φ = 663069024.

The previous prime is 672278363. The next prime is 672278393. The reversal of 672278389 is 983872276.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 491375889 + 180902500 = 22167^2 + 13450^2 .

It is a cyclic number.

It is not a de Polignac number, because 672278389 - 2²⁹ = 135407477 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (672278329) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4604574 + ... + 4604719.

It is an arithmetic number, because the mean of its divisors is an integer number (170371939).

Almost surely, 2^672278389 is an apocalyptic number.

It is an amenable number.

672278389 is a deficient number, since it is larger than the sum of its proper divisors (9209367).

672278389 is an equidigital number, since it uses as much as digits as its factorization.

672278389 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9209366.

The product of its digits is 2032128, while the sum is 52.

The square root of 672278389 is about 25928.3317820488. The cubic root of 672278389 is about 876.0247646474.

The spelling of 672278389 in words is "six hundred seventy-two million, two hundred seventy-eight thousand, three hundred eighty-nine".