88438721 has 4 divisors (see below), whose sum is σ = 101072832. Its totient is φ = 75804612.

The previous prime is 88438687. The next prime is 88438723. The reversal of 88438721 is 12783488.

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 a de Polignac number, because none of the positive numbers 2^k-88438721 is a prime.

It is not an unprimeable number, because it can be changed into a prime (88438723) 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, 6317045 + ... + 6317058.

It is an arithmetic number, because the mean of its divisors is an integer number (25268208).

Almost surely, 2^88438721 is an apocalyptic number.

It is an amenable number.

88438721 is a deficient number, since it is larger than the sum of its proper divisors (12634111).

88438721 is a wasteful number, since it uses less digits than its factorization.

88438721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12634110.

The product of its digits is 86016, while the sum is 41.

The square root of 88438721 is about 9404.1863550230. The cubic root of 88438721 is about 445.5339649278.

The spelling of 88438721 in words is "eighty-eight million, four hundred thirty-eight thousand, seven hundred twenty-one".