672009073 has 2 divisors, whose sum is σ = 672009074. Its totient is φ = 672009072.

The previous prime is 672009071. The next prime is 672009127. The reversal of 672009073 is 370900276.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 506835169 + 165173904 = 22513^2 + 12852^2 .

It is a cyclic number.

It is not a de Polignac number, because 672009073 - 2¹ = 672009071 is a prime.

Together with 672009071, it forms a pair of twin primes.

It is equal to p_34877203 and since 672009073 and 34877203 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (672009071) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 336004536 + 336004537.

It is an arithmetic number, because the mean of its divisors is an integer number (336004537).

Almost surely, 2^672009073 is an apocalyptic number.

672009073 is the 13857-th centered heptagonal number.

It is an amenable number.

672009073 is a deficient number, since it is larger than the sum of its proper divisors (1).

672009073 is an equidigital number, since it uses as much as digits as its factorization.

672009073 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15876, while the sum is 34.

The square root of 672009073 is about 25923.1377923275. The cubic root of 672009073 is about 875.9077699615.

The spelling of 672009073 in words is "six hundred seventy-two million, nine thousand, seventy-three".