63499720 has 32 divisors (see below), whose sum is σ = 144487800. Its totient is φ = 25113088.

The previous prime is 63499717. The next prime is 63499727. The reversal of 63499720 is 2799436.

It can be written as a sum of positive squares in 4 ways, for example, as 52330756 + 11168964 = 7234^2 + 3342^2 .

It is a Harshad number since it is a multiple of its sum of digits (40).

It is not an unprimeable number, because it can be changed into a prime (63499727) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5359 + ... + 12478.

Almost surely, 2^63499720 is an apocalyptic number.

It is an amenable number.

63499720 is an abundant number, since it is smaller than the sum of its proper divisors (80988080).

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

63499720 is a wasteful number, since it uses less digits than its factorization.

63499720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17937 (or 17933 counting only the distinct ones).

The product of its (nonzero) digits is 81648, while the sum is 40.

The square root of 63499720 is about 7968.6711564727. The cubic root of 63499720 is about 398.9550224320.

The spelling of 63499720 in words is "sixty-three million, four hundred ninety-nine thousand, seven hundred twenty".