88218621 has 12 divisors (see below), whose sum is σ = 127509148. Its totient is φ = 58774464.

The previous prime is 88218617. The next prime is 88218623. The reversal of 88218621 is 12681288.

88218621 is a `hidden beast` number, since 8 + 8 + 21 + 8 + 621 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 40068900 + 48149721 = 6330^2 + 6939^2 .

It is not a de Polignac number, because 88218621 - 2² = 88218617 is a prime.

It is a super-2 number, since 2×88218621² = 15565050182283282, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (88218623) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 22611 + ... + 26223.

Almost surely, 2^88218621 is an apocalyptic number.

It is an amenable number.

88218621 is a deficient number, since it is larger than the sum of its proper divisors (39290527).

88218621 is a wasteful number, since it uses less digits than its factorization.

88218621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6332 (or 6329 counting only the distinct ones).

The product of its digits is 12288, while the sum is 36.

The square root of 88218621 is about 9392.4768298889. The cubic root of 88218621 is about 445.1640534714.

It can be divided in two parts, 882 and 18621, that added together give a triangular number (19503 = T₁₉₇).

The spelling of 88218621 in words is "eighty-eight million, two hundred eighteen thousand, six hundred twenty-one".