672649 has 4 divisors (see below), whose sum is σ = 688336. Its totient is φ = 656964.

The previous prime is 672643. The next prime is 672653. The reversal of 672649 is 946276.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 672649 - 2³ = 672641 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (672641) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7779 + ... + 7864.

It is an arithmetic number, because the mean of its divisors is an integer number (172084).

2⁶⁷²⁶⁴⁹ is an apocalyptic number.

It is an amenable number.

672649 is a deficient number, since it is larger than the sum of its proper divisors (15687).

672649 is a wasteful number, since it uses less digits than its factorization.

672649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15686.

The product of its digits is 18144, while the sum is 34.

The square root of 672649 is about 820.1518152147. The cubic root of 672649 is about 87.6185712244.

The spelling of 672649 in words is "six hundred seventy-two thousand, six hundred forty-nine".