1672507321 has 8 divisors (see below), whose sum is σ = 1677693960. Its totient is φ = 1667329152.

The previous prime is 1672507297. The next prime is 1672507327. The reversal of 1672507321 is 1237052761.

It can be written as a sum of positive squares in 4 ways, for example, as 585882025 + 1086625296 = 24205^2 + 32964^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1672507321 - 2⁵ = 1672507289 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1672507327) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 728251 + ... + 730543.

It is an arithmetic number, because the mean of its divisors is an integer number (209711745).

Almost surely, 2^1672507321 is an apocalyptic number.

It is an amenable number.

1672507321 is a deficient number, since it is larger than the sum of its proper divisors (5186639).

1672507321 is a wasteful number, since it uses less digits than its factorization.

1672507321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4235.

The product of its (nonzero) digits is 17640, while the sum is 34.

The square root of 1672507321 is about 40896.2996003306. The cubic root of 1672507321 is about 1187.0144590963.

The spelling of 1672507321 in words is "one billion, six hundred seventy-two million, five hundred seven thousand, three hundred twenty-one".