88905721 has 2 divisors, whose sum is σ = 88905722. Its totient is φ = 88905720.

The previous prime is 88905697. The next prime is 88905757. The reversal of 88905721 is 12750988.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 79905721 + 9000000 = 8939^2 + 3000^2 .

It is a cyclic number.

It is not a de Polignac number, because 88905721 - 2⁵ = 88905689 is a prime.

It is not a weakly prime, because it can be changed into another prime (88905781) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 44452860 + 44452861.

It is an arithmetic number, because the mean of its divisors is an integer number (44452861).

Almost surely, 2^88905721 is an apocalyptic number.

It is an amenable number.

88905721 is a deficient number, since it is larger than the sum of its proper divisors (1).

88905721 is an equidigital number, since it uses as much as digits as its factorization.

88905721 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 40320, while the sum is 40.

The square root of 88905721 is about 9428.9830310591. The cubic root of 88905721 is about 446.3168015347.

The spelling of 88905721 in words is "eighty-eight million, nine hundred five thousand, seven hundred twenty-one".