72781022 has 8 divisors (see below), whose sum is σ = 109284672. Its totient is φ = 36352800.

The previous prime is 72781021. The next prime is 72781057. The reversal of 72781022 is 22018727.

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

It is a plaindrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72781021) 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, 16379 + ... + 20342.

It is an arithmetic number, because the mean of its divisors is an integer number (13660584).

Almost surely, 2^72781022 is an apocalyptic number.

72781022 is a deficient number, since it is larger than the sum of its proper divisors (36503650).

72781022 is a wasteful number, since it uses less digits than its factorization.

72781022 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37714.

The product of its (nonzero) digits is 3136, while the sum is 29.

The square root of 72781022 is about 8531.1794026383. The cubic root of 72781022 is about 417.5156091550.

Adding to 72781022 its reverse (22018727), we get a palindrome (94799749).

The spelling of 72781022 in words is "seventy-two million, seven hundred eighty-one thousand, twenty-two".