88357721 has 4 divisors (see below), whose sum is σ = 93555252. Its totient is φ = 83160192.

The previous prime is 88357663. The next prime is 88357757. The reversal of 88357721 is 12775388.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 73342096 + 15015625 = 8564^2 + 3875^2 .

It is a de Polignac number, because none of the positive numbers 2^k-88357721 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (88357021) 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 3 ways as a sum of consecutive naturals, for example, 2598740 + ... + 2598773.

It is an arithmetic number, because the mean of its divisors is an integer number (23388813).

Almost surely, 2^88357721 is an apocalyptic number.

It is an amenable number.

88357721 is a deficient number, since it is larger than the sum of its proper divisors (5197531).

88357721 is a wasteful number, since it uses less digits than its factorization.

88357721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5197530.

The product of its digits is 94080, while the sum is 41.

The square root of 88357721 is about 9399.8787758141. The cubic root of 88357721 is about 445.3979035814.

The spelling of 88357721 in words is "eighty-eight million, three hundred fifty-seven thousand, seven hundred twenty-one".