78664967 has 8 divisors (see below), whose sum is σ = 83373696. Its totient is φ = 73965312.

The previous prime is 78664919. The next prime is 78664969. The reversal of 78664967 is 76946687.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 78664967 - 2⁸ = 78664711 is a prime.

It is a super-2 number, since 2×78664967² = 12376354066222178, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78664969) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25163 + ... + 28115.

It is an arithmetic number, because the mean of its divisors is an integer number (10421712).

Almost surely, 2^78664967 is an apocalyptic number.

78664967 is a deficient number, since it is larger than the sum of its proper divisors (4708729).

78664967 is a wasteful number, since it uses less digits than its factorization.

78664967 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4537.

The product of its digits is 3048192, while the sum is 53.

The square root of 78664967 is about 8869.3273138384. The cubic root of 78664967 is about 428.4766122574.

The spelling of 78664967 in words is "seventy-eight million, six hundred sixty-four thousand, nine hundred sixty-seven".