72822991 has 8 divisors (see below), whose sum is σ = 79989120. Its totient is φ = 65990232.

The previous prime is 72822989. The next prime is 72823001. The reversal of 72822991 is 19922827.

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

It is a cyclic number.

It is not a de Polignac number, because 72822991 - 2¹ = 72822989 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72822961) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 82885 + ... + 83758.

It is an arithmetic number, because the mean of its divisors is an integer number (9998640).

Almost surely, 2^72822991 is an apocalyptic number.

72822991 is a deficient number, since it is larger than the sum of its proper divisors (7166129).

72822991 is a wasteful number, since it uses less digits than its factorization.

72822991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 166685.

The product of its digits is 36288, while the sum is 40.

The square root of 72822991 is about 8533.6387901059. The cubic root of 72822991 is about 417.5958468555.

The spelling of 72822991 in words is "seventy-two million, eight hundred twenty-two thousand, nine hundred ninety-one".