78729667 has 8 divisors (see below), whose sum is σ = 83077920. Its totient is φ = 74458560.

The previous prime is 78729661. The next prime is 78729683. The reversal of 78729667 is 76692787.

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 78729667 - 2¹¹ = 78727619 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78729661) 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, 17184 + ... + 21277.

It is an arithmetic number, because the mean of its divisors is an integer number (10384740).

Almost surely, 2^78729667 is an apocalyptic number.

78729667 is a deficient number, since it is larger than the sum of its proper divisors (4348253).

78729667 is a wasteful number, since it uses less digits than its factorization.

78729667 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38573.

The product of its digits is 1778112, while the sum is 52.

The square root of 78729667 is about 8872.9739659260. The cubic root of 78729667 is about 428.5940505572.

The spelling of 78729667 in words is "seventy-eight million, seven hundred twenty-nine thousand, six hundred sixty-seven".