63491720 has 32 divisors (see below), whose sum is σ = 147467520. Its totient is φ = 24576960.

The previous prime is 63491717. The next prime is 63491761. The reversal of 63491720 is 2719436.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24362 + ... + 26841.

It is an arithmetic number, because the mean of its divisors is an integer number (4608360).

Almost surely, 2^63491720 is an apocalyptic number.

It is an amenable number.

63491720 is an abundant number, since it is smaller than the sum of its proper divisors (83975800).

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

63491720 is a wasteful number, since it uses less digits than its factorization.

63491720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51245 (or 51241 counting only the distinct ones).

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

The square root of 63491720 is about 7968.1691749109. The cubic root of 63491720 is about 398.9382676378.

The spelling of 63491720 in words is "sixty-three million, four hundred ninety-one thousand, seven hundred twenty".