72251770 has 8 divisors (see below), whose sum is σ = 130053204. Its totient is φ = 28900704.

The previous prime is 72251747. The next prime is 72251771. The reversal of 72251770 is 7715227.

It can be written as a sum of positive squares in 2 ways, for example, as 72233001 + 18769 = 8499^2 + 137^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (72251771) 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, 3612579 + ... + 3612598.

Almost surely, 2^72251770 is an apocalyptic number.

72251770 is a deficient number, since it is larger than the sum of its proper divisors (57801434).

72251770 is a wasteful number, since it uses less digits than its factorization.

72251770 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7225184.

The product of its (nonzero) digits is 6860, while the sum is 31.

The square root of 72251770 is about 8500.1041170094. The cubic root of 72251770 is about 416.5011104052.

Adding to 72251770 its reverse (7715227), we get a palindrome (79966997).

The spelling of 72251770 in words is "seventy-two million, two hundred fifty-one thousand, seven hundred seventy".