78555541 has 4 divisors (see below), whose sum is σ = 78908032. Its totient is φ = 78203052.

The previous prime is 78555509. The next prime is 78555569. The reversal of 78555541 is 14555587.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 78555541 - 2⁵ = 78555509 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 78555494 and 78555503.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78555241) 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, 175911 + ... + 176356.

It is an arithmetic number, because the mean of its divisors is an integer number (19727008).

Almost surely, 2^78555541 is an apocalyptic number.

It is an amenable number.

78555541 is a deficient number, since it is larger than the sum of its proper divisors (352491).

78555541 is a wasteful number, since it uses less digits than its factorization.

78555541 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 352490.

The product of its digits is 140000, while the sum is 40.

The square root of 78555541 is about 8863.1563790785. The cubic root of 78555541 is about 428.2778442387.

The spelling of 78555541 in words is "seventy-eight million, five hundred fifty-five thousand, five hundred forty-one".