63724391 has 4 divisors (see below), whose sum is σ = 64926792. Its totient is φ = 62521992.

The previous prime is 63724387. The next prime is 63724399. The reversal of 63724391 is 19342736.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 63724391 - 2² = 63724387 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (63724399) 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, 601121 + ... + 601226.

It is an arithmetic number, because the mean of its divisors is an integer number (16231698).

Almost surely, 2^63724391 is an apocalyptic number.

63724391 is a deficient number, since it is larger than the sum of its proper divisors (1202401).

63724391 is a wasteful number, since it uses less digits than its factorization.

63724391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1202400.

The product of its digits is 27216, while the sum is 35.

The square root of 63724391 is about 7982.7558524610. The cubic root of 63724391 is about 399.4249883835.

The spelling of 63724391 in words is "sixty-three million, seven hundred twenty-four thousand, three hundred ninety-one".