63904140 has 108 divisors (see below), whose sum is σ = 201701136. Its totient is φ = 17006112.

The previous prime is 63904133. The next prime is 63904151. The reversal of 63904140 is 4140936.

It is a tau number, because it is divible by the number of its divisors (108).

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a zygodrome in base 2.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 130977 + ... + 131463.

Almost surely, 2^63904140 is an apocalyptic number.

63904140 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 63904140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (100850568).

63904140 is an abundant number, since it is smaller than the sum of its proper divisors (137796996).

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

63904140 is an equidigital number, since it uses as much as digits as its factorization.

63904140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 520 (or 497 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 27.

The square root of 63904140 is about 7994.0065048760. The cubic root of 63904140 is about 399.8001918751.

The spelling of 63904140 in words is "sixty-three million, nine hundred four thousand, one hundred forty".