78542641 has 4 divisors (see below), whose sum is σ = 78624832. Its totient is φ = 78460452.

The previous prime is 78542627. The next prime is 78542657. The reversal of 78542641 is 14624587.

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, and also an emirpimes, since its reverse is a distinct semiprime: 14624587 = 3709 ⋅3943.

It is a cyclic number.

It is not a de Polignac number, because 78542641 - 2⁵ = 78542609 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 78542641.

It is not an unprimeable number, because it can be changed into a prime (78540641) 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, 39645 + ... + 41578.

It is an arithmetic number, because the mean of its divisors is an integer number (19656208).

Almost surely, 2^78542641 is an apocalyptic number.

It is an amenable number.

78542641 is a deficient number, since it is larger than the sum of its proper divisors (82191).

78542641 is an equidigital number, since it uses as much as digits as its factorization.

78542641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82190.

The product of its digits is 53760, while the sum is 37.

The square root of 78542641 is about 8862.4286174840. The cubic root of 78542641 is about 428.2543997366.

The spelling of 78542641 in words is "seventy-eight million, five hundred forty-two thousand, six hundred forty-one".