88442721 has 48 divisors (see below), whose sum is σ = 144668160. Its totient is φ = 51770880.

The previous prime is 88442693. The next prime is 88442737. The reversal of 88442721 is 12724488.

It is not a de Polignac number, because 88442721 - 2⁵ = 88442689 is a prime.

It is a super-2 number, since 2×88442721² = 15644229795767682, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (88442621) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 137226 + ... + 137868.

It is an arithmetic number, because the mean of its divisors is an integer number (3013920).

Almost surely, 2^88442721 is an apocalyptic number.

It is an amenable number.

88442721 is a deficient number, since it is larger than the sum of its proper divisors (56225439).

88442721 is a wasteful number, since it uses less digits than its factorization.

88442721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 726 (or 723 counting only the distinct ones).

The product of its digits is 28672, while the sum is 36.

The square root of 88442721 is about 9404.3990238611. The cubic root of 88442721 is about 445.5406818537.

The spelling of 88442721 in words is "eighty-eight million, four hundred forty-two thousand, seven hundred twenty-one".