64692409 has 8 divisors (see below), whose sum is σ = 65654280. Its totient is φ = 63735936.

The previous prime is 64692401. The next prime is 64692427. The reversal of 64692409 is 90429646.

It can be written as a sum of positive squares in 4 ways, for example, as 1537600 + 63154809 = 1240^2 + 7947^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 64692409 - 2³ = 64692401 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64692401) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27067 + ... + 29359.

It is an arithmetic number, because the mean of its divisors is an integer number (8206785).

Almost surely, 2^64692409 is an apocalyptic number.

It is an amenable number.

64692409 is a deficient number, since it is larger than the sum of its proper divisors (961871).

64692409 is a wasteful number, since it uses less digits than its factorization.

64692409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2699.

The product of its (nonzero) digits is 93312, while the sum is 40.

The square root of 64692409 is about 8043.1591430233. The cubic root of 64692409 is about 401.4373476429.

The spelling of 64692409 in words is "sixty-four million, six hundred ninety-two thousand, four hundred nine".