63891357438 has 16 divisors (see below), whose sum is σ = 133338485376. Its totient is φ = 20371157400.

The previous prime is 63891357427. The next prime is 63891357449. The reversal of 63891357438 is 83475319836.

It is an interprime number because it is at equal distance from previous prime (63891357427) and next prime (63891357449).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 231490288 + ... + 231490563.

It is an arithmetic number, because the mean of its divisors is an integer number (8333655336).

Almost surely, 2^63891357438 is an apocalyptic number.

63891357438 is an abundant number, since it is smaller than the sum of its proper divisors (69447127938).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

63891357438 is a wasteful number, since it uses less digits than its factorization.

63891357438 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 462980879.

The product of its digits is 13063680, while the sum is 57.

The spelling of 63891357438 in words is "sixty-three billion, eight hundred ninety-one million, three hundred fifty-seven thousand, four hundred thirty-eight".