67649573440 has 28 divisors (see below), whose sum is σ = 161090547516. Its totient is φ = 27059829248.

The previous prime is 67649573437. The next prime is 67649573447. The reversal of 67649573440 is 4437594676.

It can be written as a sum of positive squares in 2 ways, for example, as 49333740544 + 18315832896 = 222112^2 + 135336^2 .

It is a super-2 number, since 2×67649573440² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (67649573447) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 105702139 + ... + 105702778.

Almost surely, 2^67649573440 is an apocalyptic number.

It is an amenable number.

67649573440 is an abundant number, since it is smaller than the sum of its proper divisors (93440974076).

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

67649573440 is a wasteful number, since it uses less digits than its factorization.

67649573440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 211404934 (or 211404924 counting only the distinct ones).

The product of its (nonzero) digits is 15240960, while the sum is 55.

The spelling of 67649573440 in words is "sixty-seven billion, six hundred forty-nine million, five hundred seventy-three thousand, four hundred forty".