7644021797 has 8 divisors (see below), whose sum is σ = 8094551256. Its totient is φ = 7193590272.

The previous prime is 7644021793. The next prime is 7644021799. The reversal of 7644021797 is 7971204467.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 1071514756 + 6572507041 = 32734^2 + 81071^2 .

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 7644021797 - 2² = 7644021793 is a prime.

It is a super-2 number, since 2×7644021797² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7644021793) 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, 189953 + ... + 226649.

It is an arithmetic number, because the mean of its divisors is an integer number (1011818907).

Almost surely, 2^7644021797 is an apocalyptic number.

It is an amenable number.

7644021797 is a deficient number, since it is larger than the sum of its proper divisors (450529459).

7644021797 is a wasteful number, since it uses less digits than its factorization.

7644021797 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48967.

The product of its (nonzero) digits is 592704, while the sum is 47.

The square root of 7644021797 is about 87430.0966315376. The cubic root of 7644021797 is about 1969.8839373505.

The spelling of 7644021797 in words is "seven billion, six hundred forty-four million, twenty-one thousand, seven hundred ninety-seven".