78934887949 has 4 divisors (see below), whose sum is σ = 79043464864. Its totient is φ = 78826311036.

The previous prime is 78934887887. The next prime is 78934887961. The reversal of 78934887949 is 94978843987.

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 78934887949 - 2⁷ = 78934887821 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78934884949) 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, 54287367 + ... + 54288820.

It is an arithmetic number, because the mean of its divisors is an integer number (19760866216).

Almost surely, 2^78934887949 is an apocalyptic number.

It is an amenable number.

78934887949 is a deficient number, since it is larger than the sum of its proper divisors (108576915).

78934887949 is a wasteful number, since it uses less digits than its factorization.

78934887949 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108576914.

The product of its digits is 877879296, while the sum is 76.

The spelling of 78934887949 in words is "seventy-eight billion, nine hundred thirty-four million, eight hundred eighty-seven thousand, nine hundred forty-nine".