78658643 has 32 divisors (see below), whose sum is σ = 102850560. Its totient is φ = 58544640.

The previous prime is 78658639. The next prime is 78658649. The reversal of 78658643 is 34685687.

It is not a de Polignac number, because 78658643 - 2² = 78658639 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78658649) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 78878 + ... + 79868.

It is an arithmetic number, because the mean of its divisors is an integer number (3214080).

Almost surely, 2^78658643 is an apocalyptic number.

78658643 is a deficient number, since it is larger than the sum of its proper divisors (24191917).

78658643 is a wasteful number, since it uses less digits than its factorization.

78658643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1067.

The product of its digits is 967680, while the sum is 47.

The square root of 78658643 is about 8868.9707971106. The cubic root of 78658643 is about 428.4651299809.

The spelling of 78658643 in words is "seventy-eight million, six hundred fifty-eight thousand, six hundred forty-three".