67764409 has 4 divisors (see below), whose sum is σ = 68138980. Its totient is φ = 67389840.

The previous prime is 67764401. The next prime is 67764413. The reversal of 67764409 is 90446776.

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

It can be written as a sum of positive squares in 2 ways, for example, as 12960000 + 54804409 = 3600^2 + 7403^2 .

It is a cyclic number.

It is not a de Polignac number, because 67764409 - 2³ = 67764401 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (67764401) 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, 187014 + ... + 187375.

It is an arithmetic number, because the mean of its divisors is an integer number (17034745).

Almost surely, 2^67764409 is an apocalyptic number.

It is an amenable number.

67764409 is a deficient number, since it is larger than the sum of its proper divisors (374571).

67764409 is a wasteful number, since it uses less digits than its factorization.

67764409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 374570.

The product of its (nonzero) digits is 254016, while the sum is 43.

The square root of 67764409 is about 8231.9140544590. The cubic root of 67764409 is about 407.6935916318.

The spelling of 67764409 in words is "sixty-seven million, seven hundred sixty-four thousand, four hundred nine".