63457991 has 8 divisors (see below), whose sum is σ = 67845024. Its totient is φ = 59143680.

The previous prime is 63457931. The next prime is 63457993. The reversal of 63457991 is 19975436.

63457991 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-63457991 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 (63457993) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16370 + ... + 19871.

It is an arithmetic number, because the mean of its divisors is an integer number (8480628).

Almost surely, 2^63457991 is an apocalyptic number.

63457991 is a deficient number, since it is larger than the sum of its proper divisors (4387033).

63457991 is a wasteful number, since it uses less digits than its factorization.

63457991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36361.

The product of its digits is 204120, while the sum is 44.

The square root of 63457991 is about 7966.0524100711. The cubic root of 63457991 is about 398.8676118512.

The spelling of 63457991 in words is "sixty-three million, four hundred fifty-seven thousand, nine hundred ninety-one".