63640297 has 16 divisors (see below), whose sum is σ = 75600000. Its totient is φ = 52416000.

The previous prime is 63640279. The next prime is 63640307. The reversal of 63640297 is 79204636.

It is not a de Polignac number, because 63640297 - 2⁷ = 63640169 is a prime.

It is not an unprimeable number, because it can be changed into a prime (63640207) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 50329 + ... + 51577.

It is an arithmetic number, because the mean of its divisors is an integer number (4725000).

Almost surely, 2^63640297 is an apocalyptic number.

It is an amenable number.

63640297 is a deficient number, since it is larger than the sum of its proper divisors (11959703).

63640297 is a wasteful number, since it uses less digits than its factorization.

63640297 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1536.

The product of its (nonzero) digits is 54432, while the sum is 37.

The square root of 63640297 is about 7977.4868849783. The cubic root of 63640297 is about 399.2492104192.

The spelling of 63640297 in words is "sixty-three million, six hundred forty thousand, two hundred ninety-seven".