421778443746 has 32 divisors (see below), whose sum is σ = 920351351808. Its totient is φ = 127796722640.

The previous prime is 421778443637. The next prime is 421778443799. The reversal of 421778443746 is 647344877124.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 202915 + ... + 940601.

It is an arithmetic number, because the mean of its divisors is an integer number (28760979744).

Almost surely, 2^421778443746 is an apocalyptic number.

421778443746 is an abundant number, since it is smaller than the sum of its proper divisors (498572908062).

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

421778443746 is a wasteful number, since it uses less digits than its factorization.

421778443746 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 746366.

The product of its digits is 25288704, while the sum is 57.

The spelling of 421778443746 in words is "four hundred twenty-one billion, seven hundred seventy-eight million, four hundred forty-three thousand, seven hundred forty-six".