88105721 has 4 divisors (see below), whose sum is σ = 96115344. Its totient is φ = 80096100.

The previous prime is 88105711. The next prime is 88105723. The reversal of 88105721 is 12750188.

It is a happy number.

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 88105721 - 2⁶ = 88105657 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (88105723) 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, 4004795 + ... + 4004816.

It is an arithmetic number, because the mean of its divisors is an integer number (24028836).

Almost surely, 2^88105721 is an apocalyptic number.

It is an amenable number.

88105721 is a deficient number, since it is larger than the sum of its proper divisors (8009623).

88105721 is a wasteful number, since it uses less digits than its factorization.

88105721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8009622.

The product of its (nonzero) digits is 4480, while the sum is 32.

The square root of 88105721 is about 9386.4647764747. The cubic root of 88105721 is about 444.9740691030.

The spelling of 88105721 in words is "eighty-eight million, one hundred five thousand, seven hundred twenty-one".