63722091 has 4 divisors (see below), whose sum is σ = 84962792. Its totient is φ = 42481392.

The previous prime is 63722063. The next prime is 63722093. The reversal of 63722091 is 19022736.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 63722091 - 2¹¹ = 63720043 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (63722093) 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, 10620346 + ... + 10620351.

It is an arithmetic number, because the mean of its divisors is an integer number (21240698).

Almost surely, 2^63722091 is an apocalyptic number.

63722091 is a deficient number, since it is larger than the sum of its proper divisors (21240701).

63722091 is a wasteful number, since it uses less digits than its factorization.

63722091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21240700.

The product of its (nonzero) digits is 4536, while the sum is 30.

The square root of 63722091 is about 7982.6117906359. The cubic root of 63722091 is about 399.4201828530.

The spelling of 63722091 in words is "sixty-three million, seven hundred twenty-two thousand, ninety-one".