672990137 has 4 divisors (see below), whose sum is σ = 673125456. Its totient is φ = 672854820.

The previous prime is 672990107. The next prime is 672990161. The reversal of 672990137 is 731099276.

It is a happy number.

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 672990137 - 2²² = 668795833 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (672990107) 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, 59903 + ... + 70244.

It is an arithmetic number, because the mean of its divisors is an integer number (168281364).

Almost surely, 2^672990137 is an apocalyptic number.

It is an amenable number.

672990137 is a deficient number, since it is larger than the sum of its proper divisors (135319).

672990137 is a wasteful number, since it uses less digits than its factorization.

672990137 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 135318.

The product of its (nonzero) digits is 142884, while the sum is 44.

The square root of 672990137 is about 25942.0534460940. The cubic root of 672990137 is about 876.3338077340. Note that the first 3 decimals are identical.

The spelling of 672990137 in words is "six hundred seventy-two million, nine hundred ninety thousand, one hundred thirty-seven".