88817821 has 4 divisors (see below), whose sum is σ = 91682944. Its totient is φ = 85952700.

The previous prime is 88817801. The next prime is 88817851. The reversal of 88817821 is 12871888.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 88817821 - 2⁷ = 88817693 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (88817801) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1432515 + ... + 1432576.

It is an arithmetic number, because the mean of its divisors is an integer number (22920736).

Almost surely, 2^88817821 is an apocalyptic number.

It is an amenable number.

88817821 is a deficient number, since it is larger than the sum of its proper divisors (2865123).

88817821 is a wasteful number, since it uses less digits than its factorization.

88817821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2865122.

The product of its digits is 57344, while the sum is 43.

The square root of 88817821 is about 9424.3207182269. The cubic root of 88817821 is about 446.1696637102.

The spelling of 88817821 in words is "eighty-eight million, eight hundred seventeen thousand, eight hundred twenty-one".