78662401 has 4 divisors (see below), whose sum is σ = 78712900. Its totient is φ = 78611904.

The previous prime is 78662377. The next prime is 78662411. The reversal of 78662401 is 10426687.

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 65529025 + 13133376 = 8095^2 + 3624^2 .

It is a cyclic number.

It is not a de Polignac number, because 78662401 - 2²⁵ = 45107969 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78662411) 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, 22836 + ... + 26053.

It is an arithmetic number, because the mean of its divisors is an integer number (19678225).

Almost surely, 2^78662401 is an apocalyptic number.

It is an amenable number.

78662401 is a deficient number, since it is larger than the sum of its proper divisors (50499).

78662401 is a wasteful number, since it uses less digits than its factorization.

78662401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50498.

The product of its (nonzero) digits is 16128, while the sum is 34.

The square root of 78662401 is about 8869.1826568179. The cubic root of 78662401 is about 428.4719533307.

The spelling of 78662401 in words is "seventy-eight million, six hundred sixty-two thousand, four hundred one".