88684721 has 2 divisors, whose sum is σ = 88684722. Its totient is φ = 88684720.

The previous prime is 88684709. The next prime is 88684787. The reversal of 88684721 is 12748688.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 57760000 + 30924721 = 7600^2 + 5561^2 .

It is a cyclic number.

It is not a de Polignac number, because 88684721 - 2²⁶ = 21575857 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (88584721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 44342360 + 44342361.

It is an arithmetic number, because the mean of its divisors is an integer number (44342361).

Almost surely, 2^88684721 is an apocalyptic number.

It is an amenable number.

88684721 is a deficient number, since it is larger than the sum of its proper divisors (1).

88684721 is an equidigital number, since it uses as much as digits as its factorization.

88684721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 172032, while the sum is 44.

The square root of 88684721 is about 9417.2565537953. The cubic root of 88684721 is about 445.9466796640.

The spelling of 88684721 in words is "eighty-eight million, six hundred eighty-four thousand, seven hundred twenty-one".