78541601 has 4 divisors (see below), whose sum is σ = 80023572. Its totient is φ = 77059632.

The previous prime is 78541591. The next prime is 78541627. The reversal of 78541601 is 10614587.

It is a happy number.

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 33651601 + 44890000 = 5801^2 + 6700^2 .

It is a cyclic number.

It is not a de Polignac number, because 78541601 - 2⁶ = 78541537 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78541501) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 740906 + ... + 741011.

It is an arithmetic number, because the mean of its divisors is an integer number (20005893).

Almost surely, 2^78541601 is an apocalyptic number.

It is an amenable number.

78541601 is a deficient number, since it is larger than the sum of its proper divisors (1481971).

78541601 is a wasteful number, since it uses less digits than its factorization.

78541601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1481970.

The product of its (nonzero) digits is 6720, while the sum is 32.

The square root of 78541601 is about 8862.3699426282. The cubic root of 78541601 is about 428.2525095254.

The spelling of 78541601 in words is "seventy-eight million, five hundred forty-one thousand, six hundred one".