22721770 has 8 divisors (see below), whose sum is σ = 40899204. Its totient is φ = 9088704.

The previous prime is 22721767. The next prime is 22721801. The reversal of 22721770 is 7712722.

It can be written as a sum of positive squares in 2 ways, for example, as 22572001 + 149769 = 4751^2 + 387^2 .

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

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, 1136079 + ... + 1136098.

Almost surely, 2^22721770 is an apocalyptic number.

22721770 is a deficient number, since it is larger than the sum of its proper divisors (18177434).

22721770 is a wasteful number, since it uses less digits than its factorization.

22721770 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2272184.

The product of its (nonzero) digits is 2744, while the sum is 28.

The square root of 22721770 is about 4766.7357803847. The cubic root of 22721770 is about 283.2353048036.

The spelling of 22721770 in words is "twenty-two million, seven hundred twenty-one thousand, seven hundred seventy".