81078207 has 8 divisors (see below), whose sum is σ = 123547776. Its totient is φ = 46330392.

The previous prime is 81078203. The next prime is 81078223. The reversal of 81078207 is 70287018.

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

It is not a de Polignac number, because 81078207 - 2² = 81078203 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81078203) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1930413 + ... + 1930454.

It is an arithmetic number, because the mean of its divisors is an integer number (15443472).

Almost surely, 2^81078207 is an apocalyptic number.

81078207 is a deficient number, since it is larger than the sum of its proper divisors (42469569).

81078207 is a wasteful number, since it uses less digits than its factorization.

81078207 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3860877.

The product of its (nonzero) digits is 6272, while the sum is 33.

The square root of 81078207 is about 9004.3437850851. The cubic root of 81078207 is about 432.8140781663.

The spelling of 81078207 in words is "eighty-one million, seventy-eight thousand, two hundred seven".