88721511 has 32 divisors (see below), whose sum is σ = 127277568. Its totient is φ = 54848640.

The previous prime is 88721497. The next prime is 88721539. The reversal of 88721511 is 11512788.

It is not a de Polignac number, because 88721511 - 2⁹ = 88720999 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (88721551) 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 31 ways as a sum of consecutive naturals, for example, 450265 + ... + 450461.

It is an arithmetic number, because the mean of its divisors is an integer number (3977424).

Almost surely, 2^88721511 is an apocalyptic number.

88721511 is a deficient number, since it is larger than the sum of its proper divisors (38556057).

88721511 is a wasteful number, since it uses less digits than its factorization.

88721511 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 391.

The product of its digits is 4480, while the sum is 33.

The square root of 88721511 is about 9419.2096802226. The cubic root of 88721511 is about 446.0083366966.

The spelling of 88721511 in words is "eighty-eight million, seven hundred twenty-one thousand, five hundred eleven".