64402405 has 8 divisors (see below), whose sum is σ = 77326200. Its totient is φ = 51493056.

The previous prime is 64402399. The next prime is 64402411. The reversal of 64402405 is 50420446.

It is an interprime number because it is at equal distance from previous prime (64402399) and next prime (64402411).

It can be written as a sum of positive squares in 4 ways, for example, as 2669956 + 61732449 = 1634^2 + 7857^2 .

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 64402405 - 2⁹ = 64401893 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 64402405.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14151 + ... + 18139.

It is an arithmetic number, because the mean of its divisors is an integer number (9665775).

Almost surely, 2^64402405 is an apocalyptic number.

It is an amenable number.

64402405 is a deficient number, since it is larger than the sum of its proper divisors (12923795).

64402405 is a wasteful number, since it uses less digits than its factorization.

64402405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7223.

The product of its (nonzero) digits is 3840, while the sum is 25.

The square root of 64402405 is about 8025.1109026605. The cubic root of 64402405 is about 400.8365928113.

The spelling of 64402405 in words is "sixty-four million, four hundred two thousand, four hundred five".