72215072 has 12 divisors (see below), whose sum is σ = 142173486. Its totient is φ = 36107520.

The previous prime is 72215071. The next prime is 72215093. The reversal of 72215072 is 27051227.

It can be written as a sum of positive squares in only one way, i.e., 71301136 + 913936 = 8444^2 + 956^2 .

It is not an unprimeable number, because it can be changed into a prime (72215071) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1128329 + ... + 1128392.

Almost surely, 2^72215072 is an apocalyptic number.

It is an amenable number.

72215072 is a deficient number, since it is larger than the sum of its proper divisors (69958414).

72215072 is a wasteful number, since it uses less digits than its factorization.

72215072 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2256731 (or 2256723 counting only the distinct ones).

The product of its (nonzero) digits is 1960, while the sum is 26.

The square root of 72215072 is about 8497.9451633910. The cubic root of 72215072 is about 416.4305822770.

Adding to 72215072 its reverse (27051227), we get a palindrome (99266299).

The spelling of 72215072 in words is "seventy-two million, two hundred fifteen thousand, seventy-two".