78664949 has 16 divisors (see below), whose sum is σ = 88972800. Its totient is φ = 68904000.

The previous prime is 78664919. The next prime is 78664969. The reversal of 78664949 is 94946687.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-78664949 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 78664949.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78664909) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 118679 + ... + 119339.

It is an arithmetic number, because the mean of its divisors is an integer number (5560800).

Almost surely, 2^78664949 is an apocalyptic number.

It is an amenable number.

78664949 is a deficient number, since it is larger than the sum of its proper divisors (10307851).

78664949 is a wasteful number, since it uses less digits than its factorization.

78664949 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1052.

The product of its digits is 2612736, while the sum is 53.

The square root of 78664949 is about 8869.3262991052. The cubic root of 78664949 is about 428.4765795762.

The spelling of 78664949 in words is "seventy-eight million, six hundred sixty-four thousand, nine hundred forty-nine".