63221690 has 32 divisors (see below), whose sum is σ = 131410944. Its totient is φ = 21450240.

The previous prime is 63221677. The next prime is 63221693. The reversal of 63221690 is 9612236.

It is a super-2 number, since 2×63221690² = 7993964172912200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (63221693) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2135 + ... + 11445.

It is an arithmetic number, because the mean of its divisors is an integer number (4106592).

Almost surely, 2^63221690 is an apocalyptic number.

63221690 is an abundant number, since it is smaller than the sum of its proper divisors (68189254).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

63221690 is a wasteful number, since it uses less digits than its factorization.

63221690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9422.

The product of its (nonzero) digits is 3888, while the sum is 29.

The square root of 63221690 is about 7951.2068266396. The cubic root of 63221690 is about 398.3719030752.

It can be divided in two parts, 632 and 21690, that added together give a palindrome (22322).

The spelling of 63221690 in words is "sixty-three million, two hundred twenty-one thousand, six hundred ninety".