7218158464 has 64 divisors (see below), whose sum is σ = 16228220400. Its totient is φ = 3167825920.

The previous prime is 7218158461. The next prime is 7218158477. The reversal of 7218158464 is 4648518127.

It is a tau number, because it is divible by the number of its divisors (64).

It is a super-2 number, since 2×7218158464² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7218158461) 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, 47557 + ... + 129220.

Almost surely, 2^7218158464 is an apocalyptic number.

It is an amenable number.

7218158464 is an abundant number, since it is smaller than the sum of its proper divisors (9010061936).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

7218158464 is a wasteful number, since it uses less digits than its factorization.

7218158464 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 176831 (or 176819 counting only the distinct ones).

The product of its digits is 430080, while the sum is 46.

The square root of 7218158464 is about 84959.7461389804. The cubic root of 7218158464 is about 1932.6007216551.

The spelling of 7218158464 in words is "seven billion, two hundred eighteen million, one hundred fifty-eight thousand, four hundred sixty-four".