88819821 has 10 divisors (see below), whose sum is σ = 132681582. Its totient is φ = 59213160.

The previous prime is 88819807. The next prime is 88819847. The reversal of 88819821 is 12891888.

It can be written as a sum of positive squares in only one way, i.e., 54597321 + 34222500 = 7389^2 + 5850^2 .

It is not a de Polignac number, because 88819821 - 2⁷ = 88819693 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (88819021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 548190 + ... + 548351.

Almost surely, 2^88819821 is an apocalyptic number.

88819821 is a gapful number since it is divisible by the number (81) formed by its first and last digit.

It is an amenable number.

88819821 is a deficient number, since it is larger than the sum of its proper divisors (43861761).

88819821 is a wasteful number, since it uses less digits than its factorization.

88819821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1096553 (or 1096544 counting only the distinct ones).

The product of its digits is 73728, while the sum is 45.

The square root of 88819821 is about 9424.4268260728. The cubic root of 88819821 is about 446.1730126351.

The spelling of 88819821 in words is "eighty-eight million, eight hundred nineteen thousand, eight hundred twenty-one".