641973723 has 8 divisors (see below), whose sum is σ = 893180928. Its totient is φ = 409374504.

The previous prime is 641973713. The next prime is 641973751. The reversal of 641973723 is 327379146.

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

It is not a de Polignac number, because 641973723 - 2¹³ = 641965531 is a prime.

It is a super-2 number, since 2×641973723² = 824260522044961458, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (641973713) 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, 4651915 + ... + 4652052.

It is an arithmetic number, because the mean of its divisors is an integer number (111647616).

Almost surely, 2^641973723 is an apocalyptic number.

641973723 is a deficient number, since it is larger than the sum of its proper divisors (251207205).

641973723 is a wasteful number, since it uses less digits than its factorization.

641973723 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9303993.

The product of its digits is 190512, while the sum is 42.

The square root of 641973723 is about 25337.2003781002. The cubic root of 641973723 is about 862.6588538326.

The spelling of 641973723 in words is "six hundred forty-one million, nine hundred seventy-three thousand, seven hundred twenty-three".