78774213 has 12 divisors (see below), whose sum is σ = 122180640. Its totient is φ = 45013752.

The previous prime is 78774211. The next prime is 78774217. The reversal of 78774213 is 31247787.

It is not a de Polignac number, because 78774213 - 2¹ = 78774211 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78774211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 267793 + ... + 268086.

It is an arithmetic number, because the mean of its divisors is an integer number (10181720).

Almost surely, 2^78774213 is an apocalyptic number.

It is an amenable number.

78774213 is a deficient number, since it is larger than the sum of its proper divisors (43406427).

78774213 is a wasteful number, since it uses less digits than its factorization.

78774213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 535896 (or 535889 counting only the distinct ones).

The product of its digits is 65856, while the sum is 39.

The square root of 78774213 is about 8875.4838177983. The cubic root of 78774213 is about 428.6748695233.

It can be divided in two parts, 78774 and 213, that added together give a palindrome (78987).

The spelling of 78774213 in words is "seventy-eight million, seven hundred seventy-four thousand, two hundred thirteen".