63840697 has 4 divisors (see below), whose sum is σ = 63986560. Its totient is φ = 63694836.

The previous prime is 63840683. The next prime is 63840701. The reversal of 63840697 is 79604836.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-63840697 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (63840677) 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, 72273 + ... + 73150.

It is an arithmetic number, because the mean of its divisors is an integer number (15996640).

Almost surely, 2^63840697 is an apocalyptic number.

It is an amenable number.

63840697 is a deficient number, since it is larger than the sum of its proper divisors (145863).

63840697 is a wasteful number, since it uses less digits than its factorization.

63840697 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 145862.

The product of its (nonzero) digits is 217728, while the sum is 43.

The square root of 63840697 is about 7990.0373591117. The cubic root of 63840697 is about 399.6678430057.

The spelling of 63840697 in words is "sixty-three million, eight hundred forty thousand, six hundred ninety-seven".