63969621 has 8 divisors (see below), whose sum is σ = 88234080. Its totient is φ = 41175792.

The previous prime is 63969571. The next prime is 63969667. The reversal of 63969621 is 12696936.

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

It is not a de Polignac number, because 63969621 - 2⁹ = 63969109 is a prime.

It is a super-2 number, since 2×63969621² = 8184224821767282, which contains 22 as substring.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (63969671) 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, 367555 + ... + 367728.

It is an arithmetic number, because the mean of its divisors is an integer number (11029260).

Almost surely, 2^63969621 is an apocalyptic number.

It is an amenable number.

63969621 is a deficient number, since it is larger than the sum of its proper divisors (24264459).

63969621 is a wasteful number, since it uses less digits than its factorization.

63969621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 735315.

The product of its digits is 104976, while the sum is 42.

The square root of 63969621 is about 7998.1010871331. The cubic root of 63969621 is about 399.9367004001.

The spelling of 63969621 in words is "sixty-three million, nine hundred sixty-nine thousand, six hundred twenty-one".