72290770 has 8 divisors (see below), whose sum is σ = 130123404. Its totient is φ = 28916304.

The previous prime is 72290741. The next prime is 72290809. The reversal of 72290770 is 7709227.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 71351809 + 938961 = 8447^2 + 969^2 .

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

It is a super-3 number, since 3×72290770³ (a number of 25 digits) contains 333 as substring.

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, 3614529 + ... + 3614548.

Almost surely, 2^72290770 is an apocalyptic number.

72290770 is a deficient number, since it is larger than the sum of its proper divisors (57832634).

72290770 is a wasteful number, since it uses less digits than its factorization.

72290770 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7229084.

The product of its (nonzero) digits is 12348, while the sum is 34.

The square root of 72290770 is about 8502.3978970641. The cubic root of 72290770 is about 416.5760364660.

Adding to 72290770 its reverse (7709227), we get a palindrome (79999997).

The spelling of 72290770 in words is "seventy-two million, two hundred ninety thousand, seven hundred seventy".