67404720640 has 40 divisors (see below), whose sum is σ = 161613355860. Its totient is φ = 26961887232.

The previous prime is 67404720629. The next prime is 67404720661. The reversal of 67404720640 is 4602740476.

It can be written as a sum of positive squares in 2 ways, for example, as 64955658496 + 2449062144 = 254864^2 + 49488^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a junction number, because it is equal to n+sod(n) for n = 67404720593 and 67404720602.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13162425 + ... + 13167544.

Almost surely, 2^67404720640 is an apocalyptic number.

It is an amenable number.

67404720640 is an abundant number, since it is smaller than the sum of its proper divisors (94208635220).

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

67404720640 is an equidigital number, since it uses as much as digits as its factorization.

67404720640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26329992 (or 26329976 counting only the distinct ones).

The product of its (nonzero) digits is 225792, while the sum is 40.

The spelling of 67404720640 in words is "sixty-seven billion, four hundred four million, seven hundred twenty thousand, six hundred forty".