63691424 has 24 divisors (see below), whose sum is σ = 129718260. Its totient is φ = 30747136.

The previous prime is 63691423. The next prime is 63691427. The reversal of 63691424 is 42419636.

It can be written as a sum of positive squares in 2 ways, for example, as 62410000 + 1281424 = 7900^2 + 1132^2 .

It is a super-2 number, since 2×63691424² = 8113194982295552, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (63691421) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33389 + ... + 35244.

Almost surely, 2^63691424 is an apocalyptic number.

It is an amenable number.

63691424 is an abundant number, since it is smaller than the sum of its proper divisors (66026836).

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

63691424 is a wasteful number, since it uses less digits than its factorization.

63691424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68672 (or 68664 counting only the distinct ones).

The product of its digits is 31104, while the sum is 35.

The square root of 63691424 is about 7980.6906969259. The cubic root of 63691424 is about 399.3560973630.

The spelling of 63691424 in words is "sixty-three million, six hundred ninety-one thousand, four hundred twenty-four".