87330721 has 4 divisors (see below), whose sum is σ = 89361712. Its totient is φ = 85299732.

The previous prime is 87330643. The next prime is 87330799. The reversal of 87330721 is 12703378.

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 an interprime number because it is at equal distance from previous prime (87330643) and next prime (87330799).

It is a cyclic number.

It is not a de Polignac number, because 87330721 - 2¹⁷ = 87199649 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (87330521) 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, 1015431 + ... + 1015516.

It is an arithmetic number, because the mean of its divisors is an integer number (22340428).

Almost surely, 2^87330721 is an apocalyptic number.

It is an amenable number.

87330721 is a deficient number, since it is larger than the sum of its proper divisors (2030991).

87330721 is a wasteful number, since it uses less digits than its factorization.

87330721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2030990.

The product of its (nonzero) digits is 7056, while the sum is 31.

The square root of 87330721 is about 9345.0907432726. The cubic root of 87330721 is about 443.6655236667.

The spelling of 87330721 in words is "eighty-seven million, three hundred thirty thousand, seven hundred twenty-one".