63998025 has 48 divisors (see below), whose sum is σ = 130241664. Its totient is φ = 27002880.

The previous prime is 63998009. The next prime is 63998027. The reversal of 63998025 is 52089936.

It is not a de Polignac number, because 63998025 - 2⁴ = 63998009 is a prime.

It is not an unprimeable number, because it can be changed into a prime (63998027) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2137 + ... + 11513.

It is an arithmetic number, because the mean of its divisors is an integer number (2713368).

Almost surely, 2^63998025 is an apocalyptic number.

63998025 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

63998025 is an abundant number, since it is smaller than the sum of its proper divisors (66243639).

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

63998025 is a wasteful number, since it uses less digits than its factorization.

63998025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9410 (or 9405 counting only the distinct ones).

The product of its (nonzero) digits is 116640, while the sum is 42.

The square root of 63998025 is about 7999.8765615477. The cubic root of 63998025 is about 399.9958853743.

The spelling of 63998025 in words is "sixty-three million, nine hundred ninety-eight thousand, twenty-five".