63990740 has 48 divisors (see below), whose sum is σ = 147498624. Its totient is φ = 23126400.

The previous prime is 63990721. The next prime is 63990757. The reversal of 63990740 is 4709936.

It is a junction number, because it is equal to n+sod(n) for n = 63990694 and 63990703.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 39017 + ... + 40623.

It is an arithmetic number, because the mean of its divisors is an integer number (3072888).

Almost surely, 2^63990740 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 63990740, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (73749312).

63990740 is an abundant number, since it is smaller than the sum of its proper divisors (83507884).

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

63990740 is a wasteful number, since it uses less digits than its factorization.

63990740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1808 (or 1806 counting only the distinct ones).

The product of its (nonzero) digits is 40824, while the sum is 38.

The square root of 63990740 is about 7999.4212290640. The cubic root of 63990740 is about 399.9807074028.

The spelling of 63990740 in words is "sixty-three million, nine hundred ninety thousand, seven hundred forty".