78587643 has 4 divisors (see below), whose sum is σ = 104783528. Its totient is φ = 52391760.

The previous prime is 78587633. The next prime is 78587659. The reversal of 78587643 is 34678587.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 34678587 = 3 ⋅11559529.

It is not a de Polignac number, because 78587643 - 2¹⁶ = 78522107 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 78587592 and 78587601.

It is not an unprimeable number, because it can be changed into a prime (78587603) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13097938 + ... + 13097943.

It is an arithmetic number, because the mean of its divisors is an integer number (26195882).

Almost surely, 2^78587643 is an apocalyptic number.

78587643 is a deficient number, since it is larger than the sum of its proper divisors (26195885).

78587643 is a wasteful number, since it uses less digits than its factorization.

78587643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26195884.

The product of its digits is 1128960, while the sum is 48.

The square root of 78587643 is about 8864.9671742201. The cubic root of 78587643 is about 428.3361753795.

The spelling of 78587643 in words is "seventy-eight million, five hundred eighty-seven thousand, six hundred forty-three".