72320452 has 12 divisors (see below), whose sum is σ = 127681596. Its totient is φ = 35840000.

The previous prime is 72320447. The next prime is 72320467. The reversal of 72320452 is 25402327.

It can be written as a sum of positive squares in 2 ways, for example, as 40780996 + 31539456 = 6386^2 + 5616^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 79549 + ... + 80452.

It is an arithmetic number, because the mean of its divisors is an integer number (10640133).

Almost surely, 2^72320452 is an apocalyptic number.

It is an amenable number.

72320452 is a deficient number, since it is larger than the sum of its proper divisors (55361144).

72320452 is a wasteful number, since it uses less digits than its factorization.

72320452 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 160118 (or 160116 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 25.

The square root of 72320452 is about 8504.1432255107. The cubic root of 72320452 is about 416.6330429045.

Adding to 72320452 its reverse (25402327), we get a palindrome (97722779).

The spelling of 72320452 in words is "seventy-two million, three hundred twenty thousand, four hundred fifty-two".