72218488 has 8 divisors (see below), whose sum is σ = 135409680. Its totient is φ = 36109240.

The previous prime is 72218479. The next prime is 72218501. The reversal of 72218488 is 88481227.

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×72218488² = 10431020018012288, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 72218488.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4513648 + ... + 4513663.

It is an arithmetic number, because the mean of its divisors is an integer number (16926210).

Almost surely, 2^72218488 is an apocalyptic number.

It is an amenable number.

72218488 is a deficient number, since it is larger than the sum of its proper divisors (63191192).

72218488 is a wasteful number, since it uses less digits than its factorization.

72218488 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9027317 (or 9027313 counting only the distinct ones).

The product of its digits is 57344, while the sum is 40.

The square root of 72218488 is about 8498.1461507790. The cubic root of 72218488 is about 416.4371483322.

The spelling of 72218488 in words is "seventy-two million, two hundred eighteen thousand, four hundred eighty-eight".