63697920 has 352 divisors, whose sum is σ = 247605120. Its totient is φ = 13762560.

The previous prime is 63697919. The next prime is 63697939. The reversal of 63697920 is 2979636.

It is a tau number, because it is divible by the number of its divisors (352).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2196466 + ... + 2196494.

Almost surely, 2^63697920 is an apocalyptic number.

63697920 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 63697920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (123802560).

63697920 is an abundant number, since it is smaller than the sum of its proper divisors (183907200).

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

63697920 is a wasteful number, since it uses less digits than its factorization.

63697920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81 (or 63 counting only the distinct ones).

The product of its (nonzero) digits is 122472, while the sum is 42.

The square root of 63697920 is about 7981.0976688674. The cubic root of 63697920 is about 399.3696739110.

The spelling of 63697920 in words is "sixty-three million, six hundred ninety-seven thousand, nine hundred twenty".