256436464390 has 16 divisors (see below), whose sum is σ = 464002318080. Its totient is φ = 102037545280.

The previous prime is 256436464373. The next prime is 256436464391. The reversal of 256436464390 is 93464634652.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256436464391) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 67128055 + ... + 67131874.

It is an arithmetic number, because the mean of its divisors is an integer number (29000144880).

Almost surely, 2^256436464390 is an apocalyptic number.

256436464390 is a deficient number, since it is larger than the sum of its proper divisors (207565853690).

256436464390 is a wasteful number, since it uses less digits than its factorization.

256436464390 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 134260127.

The product of its (nonzero) digits is 11197440, while the sum is 52.

The spelling of 256436464390 in words is "two hundred fifty-six billion, four hundred thirty-six million, four hundred sixty-four thousand, three hundred ninety".