67393640 has 32 divisors (see below), whose sum is σ = 152075880. Its totient is φ = 26879232.

The previous prime is 67393639. The next prime is 67393649. The reversal of 67393640 is 4639376.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 32512804 + 34880836 = 5702^2 + 5906^2 .

It is a junction number, because it is equal to n+sod(n) for n = 67393594 and 67393603.

It is not an unprimeable number, because it can be changed into a prime (67393649) 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, 12662 + ... + 17178.

Almost surely, 2^67393640 is an apocalyptic number.

It is an amenable number.

67393640 is an abundant number, since it is smaller than the sum of its proper divisors (84682240).

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

67393640 is a wasteful number, since it uses less digits than its factorization.

67393640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4901 (or 4897 counting only the distinct ones).

The product of its (nonzero) digits is 81648, while the sum is 38.

The square root of 67393640 is about 8209.3629472694. The cubic root of 67393640 is about 406.9486741717.

The spelling of 67393640 in words is "sixty-seven million, three hundred ninety-three thousand, six hundred forty".