78872849 has 4 divisors (see below), whose sum is σ = 86043120. Its totient is φ = 71702580.

The previous prime is 78872839. The next prime is 78872861. The reversal of 78872849 is 94827887.

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 78872849 - 2⁸ = 78872593 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 78872849.

It is not an unprimeable number, because it can be changed into a prime (78872839) 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, 3585119 + ... + 3585140.

It is an arithmetic number, because the mean of its divisors is an integer number (21510780).

Almost surely, 2^78872849 is an apocalyptic number.

It is an amenable number.

78872849 is a deficient number, since it is larger than the sum of its proper divisors (7170271).

78872849 is a wasteful number, since it uses less digits than its factorization.

78872849 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7170270.

The product of its digits is 1806336, while the sum is 53.

The square root of 78872849 is about 8881.0387342923. The cubic root of 78872849 is about 428.8537145927.

It can be divided in two parts, 788 and 72849, that added together give a palindrome (73637).

The spelling of 78872849 in words is "seventy-eight million, eight hundred seventy-two thousand, eight hundred forty-nine".