67840453444 has 27 divisors (see below), whose sum is σ = 122703243453. Its totient is φ = 32818212000.

The previous prime is 67840453361. The next prime is 67840453517. The reversal of 67840453444 is 44435404876.

It is a happy number.

The square root of 67840453444 is 260462.

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., 3851691844 + 63988761600 = 62062^2 + 252960^2 .

It is a super-2 number, since 2×67840453444² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 16146544 + ... + 16150744.

Almost surely, 2^67840453444 is an apocalyptic number.

67840453444 is the 260462-nd square number.

It is an amenable number.

67840453444 is a deficient number, since it is larger than the sum of its proper divisors (54862790009).

67840453444 is an frugal number, since it uses more digits than its factorization.

67840453444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8468 (or 4234 counting only the distinct ones).

The product of its (nonzero) digits is 5160960, while the sum is 49.

Multiplying 67840453444 by its sum of digits (49), we get a square (3324182218756 = 1823234²).

It can be divided in two parts, 67840 and 453444, that added together give a square (521284 = 722²).

The spelling of 67840453444 in words is "sixty-seven billion, eight hundred forty million, four hundred fifty-three thousand, four hundred forty-four".