87395721 has 8 divisors (see below), whose sum is σ = 133174464. Its totient is φ = 49940400.

The previous prime is 87395719. The next prime is 87395743. The reversal of 87395721 is 12759378.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 87395721 - 2¹ = 87395719 is a prime.

It is not an unprimeable number, because it can be changed into a prime (87395761) 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 7 ways as a sum of consecutive naturals, for example, 2080830 + ... + 2080871.

It is an arithmetic number, because the mean of its divisors is an integer number (16646808).

Almost surely, 2^87395721 is an apocalyptic number.

It is an amenable number.

87395721 is a deficient number, since it is larger than the sum of its proper divisors (45778743).

87395721 is a wasteful number, since it uses less digits than its factorization.

87395721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4161711.

The product of its digits is 105840, while the sum is 42.

The square root of 87395721 is about 9348.5678582337. The cubic root of 87395721 is about 443.7755693525.

The spelling of 87395721 in words is "eighty-seven million, three hundred ninety-five thousand, seven hundred twenty-one".