7217861764 has 27 divisors (see below), whose sum is σ = 12782608293. Its totient is φ = 3566197008.

The previous prime is 7217861753. The next prime is 7217861767. The reversal of 7217861764 is 4671687127.

The square root of 7217861764 is 84958.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 4837202500 + 2380659264 = 69550^2 + 48792^2 .

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7217861767) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 18180814 + ... + 18181210.

Almost surely, 2^7217861764 is an apocalyptic number.

7217861764 is the 84958-th square number.

It is an amenable number.

7217861764 is a deficient number, since it is larger than the sum of its proper divisors (5564746529).

7217861764 is an equidigital number, since it uses as much as digits as its factorization.

7217861764 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1012 (or 506 counting only the distinct ones).

The product of its digits is 790272, while the sum is 49.

The cubic root of 7217861764 is about 1932.5742416559.

Multiplying 7217861764 by its sum of digits (49), we get a square (353675226436 = 594706²).

The spelling of 7217861764 in words is "seven billion, two hundred seventeen million, eight hundred sixty-one thousand, seven hundred sixty-four".