72290642 has 8 divisors (see below), whose sum is σ = 108483456. Its totient is φ = 36129492.

The previous prime is 72290639. The next prime is 72290677. The reversal of 72290642 is 24609227.

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

It is a super-3 number, since 3×72290642³ (a number of 25 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 72290599 and 72290608.

It is an unprimeable number.

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 in 3 ways as a sum of consecutive naturals, for example, 998 + ... + 12065.

It is an arithmetic number, because the mean of its divisors is an integer number (13560432).

Almost surely, 2^72290642 is an apocalyptic number.

72290642 is a deficient number, since it is larger than the sum of its proper divisors (36192814).

72290642 is a wasteful number, since it uses less digits than its factorization.

72290642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15832.

The product of its (nonzero) digits is 12096, while the sum is 32.

The square root of 72290642 is about 8502.3903697725. The cubic root of 72290642 is about 416.5757905989.

Adding to 72290642 its reverse (24609227), we get a palindrome (96899869).

The spelling of 72290642 in words is "seventy-two million, two hundred ninety thousand, six hundred forty-two".