72570242 has 4 divisors (see below), whose sum is σ = 108855366. Its totient is φ = 36285120.

The previous prime is 72570241. The next prime is 72570247. The reversal of 72570242 is 24207527.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 58813561 + 13756681 = 7669^2 + 3709^2 .

It is not an unprimeable number, because it can be changed into a prime (72570241) 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, 18142559 + ... + 18142562.

Almost surely, 2^72570242 is an apocalyptic number.

72570242 is a deficient number, since it is larger than the sum of its proper divisors (36285124).

72570242 is a wasteful number, since it uses less digits than its factorization.

72570242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36285123.

The product of its (nonzero) digits is 7840, while the sum is 29.

The square root of 72570242 is about 8518.8169366409. The cubic root of 72570242 is about 417.1121659210.

Adding to 72570242 its reverse (24207527), we get a palindrome (96777769).

The spelling of 72570242 in words is "seventy-two million, five hundred seventy thousand, two hundred forty-two".