63699540 has 48 divisors (see below), whose sum is σ = 178821888. Its totient is φ = 16942464.

The previous prime is 63699529. The next prime is 63699541. The reversal of 63699540 is 4599636.

63699540 = 115² + 116² + ... + 577².

It is a junction number, because it is equal to n+sod(n) for n = 63699492 and 63699501.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (63699541) 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, 26634 + ... + 28926.

It is an arithmetic number, because the mean of its divisors is an integer number (3725456).

Almost surely, 2^63699540 is an apocalyptic number.

63699540 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

63699540 is an abundant number, since it is smaller than the sum of its proper divisors (115122348).

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

63699540 is a wasteful number, since it uses less digits than its factorization.

63699540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2768 (or 2766 counting only the distinct ones).

The product of its (nonzero) digits is 174960, while the sum is 42.

The square root of 63699540 is about 7981.1991580213. The cubic root of 63699540 is about 399.3730595442.

The spelling of 63699540 in words is "sixty-three million, six hundred ninety-nine thousand, five hundred forty".