88972721 has 4 divisors (see below), whose sum is σ = 89027700. Its totient is φ = 88917744.

The previous prime is 88972699. The next prime is 88972777. The reversal of 88972721 is 12727988.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 36772096 + 52200625 = 6064^2 + 7225^2 .

It is a cyclic number.

It is not a de Polignac number, because 88972721 - 2⁶ = 88972657 is a prime.

It is a super-2 number, since 2×88972721² = 15832290164287682, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (88975721) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24986 + ... + 28323.

It is an arithmetic number, because the mean of its divisors is an integer number (22256925).

Almost surely, 2^88972721 is an apocalyptic number.

It is an amenable number.

88972721 is a deficient number, since it is larger than the sum of its proper divisors (54979).

88972721 is a wasteful number, since it uses less digits than its factorization.

88972721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54978.

The product of its digits is 112896, while the sum is 44.

The square root of 88972721 is about 9432.5352371459. The cubic root of 88972721 is about 446.4288892487.

The spelling of 88972721 in words is "eighty-eight million, nine hundred seventy-two thousand, seven hundred twenty-one".