78774949 has 4 divisors (see below), whose sum is σ = 85936320. Its totient is φ = 71613580.

The previous prime is 78774919. The next prime is 78774953. The reversal of 78774949 is 94947787.

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: 94947787 = 11 ⋅8631617.

It is a cyclic number.

It is not a de Polignac number, because 78774949 - 2¹¹ = 78772901 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 78774949.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78774919) 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, 3580669 + ... + 3580690.

It is an arithmetic number, because the mean of its divisors is an integer number (21484080).

Almost surely, 2^78774949 is an apocalyptic number.

It is an amenable number.

78774949 is a deficient number, since it is larger than the sum of its proper divisors (7161371).

78774949 is a wasteful number, since it uses less digits than its factorization.

78774949 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7161370.

The product of its digits is 3556224, while the sum is 55.

The square root of 78774949 is about 8875.5252802299. The cubic root of 78774949 is about 428.6762045783.

The spelling of 78774949 in words is "seventy-eight million, seven hundred seventy-four thousand, nine hundred forty-nine".