449138491578 has 48 divisors (see below), whose sum is σ = 1148028350976. Its totient is φ = 124185756960.

The previous prime is 449138491567. The next prime is 449138491591. The reversal of 449138491578 is 875194831944.

449138491578 is a `hidden beast` number, since 4 + 4 + 9 + 13 + 8 + 49 + 1 + 578 = 666.

It is a super-2 number, since 2×449138491578² (a number of 24 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 57489501 + ... + 57497312.

It is an arithmetic number, because the mean of its divisors is an integer number (23917257312).

Almost surely, 2^449138491578 is an apocalyptic number.

449138491578 is an abundant number, since it is smaller than the sum of its proper divisors (698889859398).

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

449138491578 is a wasteful number, since it uses less digits than its factorization.

449138491578 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 114986859 (or 114986856 counting only the distinct ones).

The product of its digits is 34836480, while the sum is 63.

The spelling of 449138491578 in words is "four hundred forty-nine billion, one hundred thirty-eight million, four hundred ninety-one thousand, five hundred seventy-eight".