281332646464 has 21 divisors (see below), whose sum is σ = 558277890681. Its totient is φ = 140664201600.

The previous prime is 281332646453. The next prime is 281332646501. The reversal of 281332646464 is 464646233182.

The square root of 281332646464 is 530408.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 30692236864 + 250640409600 = 175192^2 + 500640^2 .

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 4210114 + ... + 4276414.

It is an arithmetic number, because the mean of its divisors is an integer number (26584661461).

Almost surely, 2^281332646464 is an apocalyptic number.

281332646464 is the 530408-th square number.

It is an amenable number.

281332646464 is a deficient number, since it is larger than the sum of its proper divisors (276945244217).

281332646464 is an frugal number, since it uses more digits than its factorization.

281332646464 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132614 (or 66303 counting only the distinct ones).

The product of its digits is 3981312, while the sum is 49.

Multiplying 281332646464 by its sum of digits (49), we get a square (13785299676736 = 3712856²).

The spelling of 281332646464 in words is "two hundred eighty-one billion, three hundred thirty-two million, six hundred forty-six thousand, four hundred sixty-four".