63891345 has 24 divisors (see below), whose sum is σ = 118917504. Its totient is φ = 29207136.

The previous prime is 63891343. The next prime is 63891367. The reversal of 63891345 is 54319836.

It is not a de Polignac number, because 63891345 - 2¹ = 63891343 is a prime.

It is a super-3 number, since 3×63891345³ (a number of 24 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (63891343) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 42729 + ... + 44198.

It is an arithmetic number, because the mean of its divisors is an integer number (4954896).

Almost surely, 2^63891345 is an apocalyptic number.

It is an amenable number.

63891345 is a deficient number, since it is larger than the sum of its proper divisors (55026159).

63891345 is a wasteful number, since it uses less digits than its factorization.

63891345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86949 (or 86942 counting only the distinct ones).

The product of its digits is 77760, while the sum is 39.

The square root of 63891345 is about 7993.2061777487. The cubic root of 63891345 is about 399.7735071934.

The spelling of 63891345 in words is "sixty-three million, eight hundred ninety-one thousand, three hundred forty-five".