672421091 has 4 divisors (see below), whose sum is σ = 690594672. Its totient is φ = 654247512.

The previous prime is 672421081. The next prime is 672421103. The reversal of 672421091 is 190124276.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 672421091 - 2⁶ = 672421027 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (672421021) 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, 9086735 + ... + 9086808.

It is an arithmetic number, because the mean of its divisors is an integer number (172648668).

Almost surely, 2^672421091 is an apocalyptic number.

672421091 is a deficient number, since it is larger than the sum of its proper divisors (18173581).

672421091 is a wasteful number, since it uses less digits than its factorization.

672421091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18173580.

The product of its (nonzero) digits is 6048, while the sum is 32.

The square root of 672421091 is about 25931.0834906681. The cubic root of 672421091 is about 876.0867437540.

The spelling of 672421091 in words is "six hundred seventy-two million, four hundred twenty-one thousand, ninety-one".