63840674 has 4 divisors (see below), whose sum is σ = 95761014. Its totient is φ = 31920336.

The previous prime is 63840547. The next prime is 63840677. The reversal of 63840674 is 47604836.

It is a happy number.

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

It can be written as a sum of positive squares in only one way, i.e., 40386025 + 23454649 = 6355^2 + 4843^2 .

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 as a sum of consecutive naturals, namely, 15960167 + ... + 15960170.

Almost surely, 2^63840674 is an apocalyptic number.

63840674 is a deficient number, since it is larger than the sum of its proper divisors (31920340).

63840674 is a wasteful number, since it uses less digits than its factorization.

63840674 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31920339.

The product of its (nonzero) digits is 96768, while the sum is 38.

The square root of 63840674 is about 7990.0359198191. The cubic root of 63840674 is about 399.6677950093.

The spelling of 63840674 in words is "sixty-three million, eight hundred forty thousand, six hundred seventy-four".