63920605 has 16 divisors (see below), whose sum is σ = 90491904. Its totient is φ = 42416640.

The previous prime is 63920581. The next prime is 63920609. The reversal of 63920605 is 50602936.

It is not a de Polignac number, because 63920605 - 2⁷ = 63920477 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (63920609) 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, 28372 + ... + 30541.

It is an arithmetic number, because the mean of its divisors is an integer number (5655744).

Almost surely, 2^63920605 is an apocalyptic number.

It is an amenable number.

63920605 is a deficient number, since it is larger than the sum of its proper divisors (26571299).

63920605 is a wasteful number, since it uses less digits than its factorization.

63920605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58956.

The product of its (nonzero) digits is 9720, while the sum is 31.

The square root of 63920605 is about 7995.0362725881. The cubic root of 63920605 is about 399.8345253048.

The spelling of 63920605 in words is "sixty-three million, nine hundred twenty thousand, six hundred five".