72321029 has 4 divisors (see below), whose sum is σ = 78895680. Its totient is φ = 65746380.

The previous prime is 72321019. The next prime is 72321037. The reversal of 72321029 is 92012327.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-72321029 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 72320989 and 72321007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72321019) 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, 3287309 + ... + 3287330.

It is an arithmetic number, because the mean of its divisors is an integer number (19723920).

Almost surely, 2^72321029 is an apocalyptic number.

It is an amenable number.

72321029 is a deficient number, since it is larger than the sum of its proper divisors (6574651).

72321029 is a wasteful number, since it uses less digits than its factorization.

72321029 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6574650.

The product of its (nonzero) digits is 1512, while the sum is 26.

The square root of 72321029 is about 8504.1771500834. The cubic root of 72321029 is about 416.6341509204.

The spelling of 72321029 in words is "seventy-two million, three hundred twenty-one thousand, twenty-nine".