78681007 has 4 divisors (see below), whose sum is σ = 81219136. Its totient is φ = 76142880.

The previous prime is 78680989. The next prime is 78681037. The reversal of 78681007 is 70018687.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78681007 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78681037) 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, 1269018 + ... + 1269079.

It is an arithmetic number, because the mean of its divisors is an integer number (20304784).

Almost surely, 2^78681007 is an apocalyptic number.

78681007 is a deficient number, since it is larger than the sum of its proper divisors (2538129).

78681007 is a wasteful number, since it uses less digits than its factorization.

78681007 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2538128.

The product of its (nonzero) digits is 18816, while the sum is 37.

The square root of 78681007 is about 8870.2315076891. The cubic root of 78681007 is about 428.5057327924.

The spelling of 78681007 in words is "seventy-eight million, six hundred eighty-one thousand, seven".