7432881721 has 8 divisors (see below), whose sum is σ = 7476089544. Its totient is φ = 7389795840.

The previous prime is 7432881697. The next prime is 7432881727. The reversal of 7432881721 is 1271882347.

It can be written as a sum of positive squares in 4 ways, for example, as 1540170025 + 5892711696 = 39245^2 + 76764^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 7432881721 - 2⁵ = 7432881689 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7432881727) 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, 93225 + ... + 153481.

It is an arithmetic number, because the mean of its divisors is an integer number (934511193).

Almost surely, 2^7432881721 is an apocalyptic number.

It is an amenable number.

7432881721 is a deficient number, since it is larger than the sum of its proper divisors (43207823).

7432881721 is a wasteful number, since it uses less digits than its factorization.

7432881721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60971.

The product of its digits is 150528, while the sum is 43.

The square root of 7432881721 is about 86214.1619515031. The cubic root of 7432881721 is about 1951.5772223921.

The spelling of 7432881721 in words is "seven billion, four hundred thirty-two million, eight hundred eighty-one thousand, seven hundred twenty-one".