78000667 has 4 divisors (see below), whose sum is σ = 79814680. Its totient is φ = 76186656.

The previous prime is 78000653. The next prime is 78000673. The reversal of 78000667 is 76600087.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 78000667 - 2¹¹ = 77998619 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78000617) 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, 906942 + ... + 907027.

It is an arithmetic number, because the mean of its divisors is an integer number (19953670).

Almost surely, 2^78000667 is an apocalyptic number.

78000667 is a deficient number, since it is larger than the sum of its proper divisors (1814013).

78000667 is a wasteful number, since it uses less digits than its factorization.

78000667 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1814012.

The product of its (nonzero) digits is 14112, while the sum is 34.

The square root of 78000667 is about 8831.7986276862. The cubic root of 78000667 is about 427.2670860566.

The spelling of 78000667 in words is "seventy-eight million, six hundred sixty-seven", and thus it is an aban number.