670723653 has 4 divisors (see below), whose sum is σ = 894298208. Its totient is φ = 447149100.

The previous prime is 670723637. The next prime is 670723663. The reversal of 670723653 is 356327076.

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 not a de Polignac number, because 670723653 - 2⁴ = 670723637 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (670723663) 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, 111787273 + ... + 111787278.

It is an arithmetic number, because the mean of its divisors is an integer number (223574552).

Almost surely, 2^670723653 is an apocalyptic number.

It is an amenable number.

670723653 is a deficient number, since it is larger than the sum of its proper divisors (223574555).

670723653 is a wasteful number, since it uses less digits than its factorization.

670723653 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 223574554.

The product of its (nonzero) digits is 158760, while the sum is 39.

The square root of 670723653 is about 25898.3330158526. Note that the first 3 decimals coincide. The cubic root of 670723653 is about 875.3489342478.

The spelling of 670723653 in words is "six hundred seventy million, seven hundred twenty-three thousand, six hundred fifty-three".