67681632 has 24 divisors (see below), whose sum is σ = 177664536. Its totient is φ = 22560512.

The previous prime is 67681589. The next prime is 67681633. The reversal of 67681632 is 23618676.

It is a tau number, because it is divible by the number of its divisors (24).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (67681633) 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, 352413 + ... + 352604.

It is an arithmetic number, because the mean of its divisors is an integer number (7402689).

Almost surely, 2^67681632 is an apocalyptic number.

It is an amenable number.

67681632 is an abundant number, since it is smaller than the sum of its proper divisors (109982904).

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

67681632 is a wasteful number, since it uses less digits than its factorization.

67681632 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 705030 (or 705022 counting only the distinct ones).

The product of its digits is 72576, while the sum is 39.

The square root of 67681632 is about 8226.8847080775. The cubic root of 67681632 is about 407.5275191874.

The spelling of 67681632 in words is "sixty-seven million, six hundred eighty-one thousand, six hundred thirty-two".