63921740 has 12 divisors (see below), whose sum is σ = 134235696. Its totient is φ = 25568688.

The previous prime is 63921731. The next prime is 63921769. The reversal of 63921740 is 4712936.

It is a junction number, because it is equal to n+sod(n) for n = 63921697 and 63921706.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1598024 + ... + 1598063.

It is an arithmetic number, because the mean of its divisors is an integer number (11186308).

Almost surely, 2^63921740 is an apocalyptic number.

It is an amenable number.

63921740 is an abundant number, since it is smaller than the sum of its proper divisors (70313956).

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

63921740 is a wasteful number, since it uses less digits than its factorization.

63921740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3196096 (or 3196094 counting only the distinct ones).

The product of its (nonzero) digits is 9072, while the sum is 32.

The square root of 63921740 is about 7995.1072538147. The cubic root of 63921740 is about 399.8368918317.

The spelling of 63921740 in words is "sixty-three million, nine hundred twenty-one thousand, seven hundred forty".