67431640 has 32 divisors (see below), whose sum is σ = 153232560. Its totient is φ = 26704000.

The previous prime is 67431619. The next prime is 67431667. The reversal of 67431640 is 4613476.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4306 + ... + 12385.

Almost surely, 2^67431640 is an apocalyptic number.

It is an amenable number.

67431640 is an abundant number, since it is smaller than the sum of its proper divisors (85800920).

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

67431640 is a wasteful number, since it uses less digits than its factorization.

67431640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16803 (or 16799 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 31.

The square root of 67431640 is about 8211.6770516138. The cubic root of 67431640 is about 407.0251459973.

The spelling of 67431640 in words is "sixty-seven million, four hundred thirty-one thousand, six hundred forty".