78652405 has 8 divisors (see below), whose sum is σ = 101643192. Its totient is φ = 58081728.

The previous prime is 78652397. The next prime is 78652411. The reversal of 78652405 is 50425687.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 7941124 + 70711281 = 2818^2 + 8409^2 .

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 78652405 - 2³ = 78652397 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 604954 + ... + 605083.

It is an arithmetic number, because the mean of its divisors is an integer number (12705399).

Almost surely, 2^78652405 is an apocalyptic number.

It is an amenable number.

78652405 is a deficient number, since it is larger than the sum of its proper divisors (22990787).

78652405 is a wasteful number, since it uses less digits than its factorization.

78652405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1210055.

The product of its (nonzero) digits is 67200, while the sum is 37.

The square root of 78652405 is about 8868.6191146085. The cubic root of 78652405 is about 428.4538032487.

The spelling of 78652405 in words is "seventy-eight million, six hundred fifty-two thousand, four hundred five".