88643721 has 8 divisors (see below), whose sum is σ = 124412320. Its totient is φ = 55985472.

The previous prime is 88643717. The next prime is 88643743. The reversal of 88643721 is 12734688.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 88643721 - 2² = 88643717 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 88643721.

It is not an unprimeable number, because it can be changed into a prime (88643701) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 777520 + ... + 777633.

It is an arithmetic number, because the mean of its divisors is an integer number (15551540).

Almost surely, 2^88643721 is an apocalyptic number.

It is an amenable number.

88643721 is a deficient number, since it is larger than the sum of its proper divisors (35768599).

88643721 is a wasteful number, since it uses less digits than its factorization.

88643721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1555175.

The product of its digits is 64512, while the sum is 39.

The square root of 88643721 is about 9415.0794473547. The cubic root of 88643721 is about 445.8779469218.

The spelling of 88643721 in words is "eighty-eight million, six hundred forty-three thousand, seven hundred twenty-one".