78649693 has 4 divisors (see below), whose sum is σ = 78739648. Its totient is φ = 78559740.

The previous prime is 78649691. The next prime is 78649729. The reversal of 78649693 is 39694687.

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: 39694687 = 3929 ⋅10103.

It is a cyclic number.

It is not a de Polignac number, because 78649693 - 2¹ = 78649691 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 78649693.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78649691) 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, 43653 + ... + 45418.

It is an arithmetic number, because the mean of its divisors is an integer number (19684912).

Almost surely, 2^78649693 is an apocalyptic number.

It is an amenable number.

78649693 is a deficient number, since it is larger than the sum of its proper divisors (89955).

78649693 is an equidigital number, since it uses as much as digits as its factorization.

78649693 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89954.

The product of its digits is 1959552, while the sum is 52.

The square root of 78649693 is about 8868.4662146281. The cubic root of 78649693 is about 428.4488787116.

The spelling of 78649693 in words is "seventy-eight million, six hundred forty-nine thousand, six hundred ninety-three".