63621779 has 4 divisors (see below), whose sum is σ = 68515776. Its totient is φ = 58727784.

The previous prime is 63621743. The next prime is 63621787. The reversal of 63621779 is 97712636.

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

It is a cyclic number.

It is not a de Polignac number, because 63621779 - 2²⁴ = 46844563 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (63621799) 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, 2446979 + ... + 2447004.

It is an arithmetic number, because the mean of its divisors is an integer number (17128944).

Almost surely, 2^63621779 is an apocalyptic number.

63621779 is a deficient number, since it is larger than the sum of its proper divisors (4893997).

63621779 is a wasteful number, since it uses less digits than its factorization.

63621779 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4893996.

The product of its digits is 95256, while the sum is 41.

The square root of 63621779 is about 7976.3261593292. The cubic root of 63621779 is about 399.2104822630.

The spelling of 63621779 in words is "sixty-three million, six hundred twenty-one thousand, seven hundred seventy-nine".