88381821 has 16 divisors (see below), whose sum is σ = 132989760. Its totient is φ = 51717120.

The previous prime is 88381817. The next prime is 88381849. The reversal of 88381821 is 12818388.

It is not a de Polignac number, because 88381821 - 2² = 88381817 is a prime.

It is a super-2 number, since 2×88381821² = 15622692566552082, 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 88381821.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (88381421) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 45220 + ... + 47133.

It is an arithmetic number, because the mean of its divisors is an integer number (8311860).

Almost surely, 2^88381821 is an apocalyptic number.

It is an amenable number.

88381821 is a deficient number, since it is larger than the sum of its proper divisors (44607939).

88381821 is a wasteful number, since it uses less digits than its factorization.

88381821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 92396.

The product of its digits is 24576, while the sum is 39.

The square root of 88381821 is about 9401.1606198384. The cubic root of 88381821 is about 445.4383947182.

The spelling of 88381821 in words is "eighty-eight million, three hundred eighty-one thousand, eight hundred twenty-one".