81070678 has 16 divisors (see below), whose sum is σ = 131171040. Its totient is φ = 37357056.

The previous prime is 81070657. The next prime is 81070679. The reversal of 81070678 is 87607018.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81070679) 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, 16758 + ... + 21046.

It is an arithmetic number, because the mean of its divisors is an integer number (8198190).

Almost surely, 2^81070678 is an apocalyptic number.

81070678 is a deficient number, since it is larger than the sum of its proper divisors (50100362).

81070678 is a wasteful number, since it uses less digits than its factorization.

81070678 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5031.

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

The square root of 81070678 is about 9003.9256993825. The cubic root of 81070678 is about 432.8006805749.

The spelling of 81070678 in words is "eighty-one million, seventy thousand, six hundred seventy-eight".