78949819 has 8 divisors (see below), whose sum is σ = 90024480. Its totient is φ = 68589696.

The previous prime is 78949817. The next prime is 78949837. The reversal of 78949819 is 91894987.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 78949819 - 2¹ = 78949817 is a prime.

It is a super-2 number, since 2×78949819² = 12466147840265522, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 78949819.

It is not an unprimeable number, because it can be changed into a prime (78949813) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 178399 + ... + 178840.

It is an arithmetic number, because the mean of its divisors is an integer number (11253060).

Almost surely, 2^78949819 is an apocalyptic number.

78949819 is a deficient number, since it is larger than the sum of its proper divisors (11074661).

78949819 is a wasteful number, since it uses less digits than its factorization.

78949819 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 357269.

The product of its digits is 1306368, while the sum is 55.

The square root of 78949819 is about 8885.3710670967. The cubic root of 78949819 is about 428.9931717027.

The spelling of 78949819 in words is "seventy-eight million, nine hundred forty-nine thousand, eight hundred nineteen".