67421387 has 16 divisors (see below), whose sum is σ = 75168000. Its totient is φ = 59959200.

The previous prime is 67421383. The next prime is 67421401. The reversal of 67421387 is 78312476.

It is a cyclic number.

It is not a de Polignac number, because 67421387 - 2² = 67421383 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 67421387.

It is not an unprimeable number, because it can be changed into a prime (67421381) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 134864 + ... + 135362.

It is an arithmetic number, because the mean of its divisors is an integer number (4698000).

Almost surely, 2^67421387 is an apocalyptic number.

67421387 is a deficient number, since it is larger than the sum of its proper divisors (7746613).

67421387 is a wasteful number, since it uses less digits than its factorization.

67421387 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 754.

The product of its digits is 56448, while the sum is 38.

The square root of 67421387 is about 8211.0527339678. The cubic root of 67421387 is about 407.0045155220.

The spelling of 67421387 in words is "sixty-seven million, four hundred twenty-one thousand, three hundred eighty-seven".