72231552 has 48 divisors (see below), whose sum is σ = 207857130. Its totient is φ = 24076800.

The previous prime is 72231539. The next prime is 72231553. The reversal of 72231552 is 25513227.

It can be written as a sum of positive squares in only one way, i.e., 62346816 + 9884736 = 7896^2 + 3144^2 .

It is a tau number, because it is divible by the number of its divisors (48).

It is not an unprimeable number, because it can be changed into a prime (72231553) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 30199 + ... + 32502.

Almost surely, 2^72231552 is an apocalyptic number.

72231552 is a gapful number since it is divisible by the number (72) formed by its first and last digit.

It is an amenable number.

72231552 is an abundant number, since it is smaller than the sum of its proper divisors (135625578).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

72231552 is a wasteful number, since it uses less digits than its factorization.

72231552 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62721 (or 62706 counting only the distinct ones).

The product of its digits is 4200, while the sum is 27.

The square root of 72231552 is about 8498.9147542495. The cubic root of 72231552 is about 416.4622573546.

Adding to 72231552 its reverse (25513227), we get a palindrome (97744779).

The spelling of 72231552 in words is "seventy-two million, two hundred thirty-one thousand, five hundred fifty-two".