67401687 has 4 divisors (see below), whose sum is σ = 89868920. Its totient is φ = 44934456.

The previous prime is 67401673. The next prime is 67401689. The reversal of 67401687 is 78610476.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 67401687 - 2¹¹ = 67399639 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (67401689) 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, 11233612 + ... + 11233617.

It is an arithmetic number, because the mean of its divisors is an integer number (22467230).

Almost surely, 2^67401687 is an apocalyptic number.

67401687 is a deficient number, since it is larger than the sum of its proper divisors (22467233).

67401687 is a wasteful number, since it uses less digits than its factorization.

67401687 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22467232.

The product of its (nonzero) digits is 56448, while the sum is 39.

The square root of 67401687 is about 8209.8530437518. The cubic root of 67401687 is about 406.9648704856.

The spelling of 67401687 in words is "sixty-seven million, four hundred one thousand, six hundred eighty-seven".