78654401 has 16 divisors (see below), whose sum is σ = 91190400. Its totient is φ = 66451968.

The previous prime is 78654397. The next prime is 78654403. The reversal of 78654401 is 10445687.

It is a cyclic number.

It is not a de Polignac number, because 78654401 - 2² = 78654397 is a prime.

It is not an unprimeable number, because it can be changed into a prime (78654403) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 222641 + ... + 222993.

It is an arithmetic number, because the mean of its divisors is an integer number (5699400).

Almost surely, 2^78654401 is an apocalyptic number.

It is an amenable number.

78654401 is a deficient number, since it is larger than the sum of its proper divisors (12535999).

78654401 is a wasteful number, since it uses less digits than its factorization.

78654401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 728.

The product of its (nonzero) digits is 26880, while the sum is 35.

The square root of 78654401 is about 8868.7316455060. The cubic root of 78654401 is about 428.4574275776.

The spelling of 78654401 in words is "seventy-eight million, six hundred fifty-four thousand, four hundred one".