81760070 has 16 divisors (see below), whose sum is σ = 168192288. Its totient is φ = 28032000.

The previous prime is 81760037. The next prime is 81760087. The reversal of 81760070 is 7006718.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 583931 + ... + 584070.

It is an arithmetic number, because the mean of its divisors is an integer number (10512018).

Almost surely, 2^81760070 is an apocalyptic number.

81760070 is an abundant number, since it is smaller than the sum of its proper divisors (86432218).

81760070 is a wasteful number, since it uses less digits than its factorization.

81760070 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1168015.

The product of its (nonzero) digits is 2352, while the sum is 29.

The square root of 81760070 is about 9042.1275151371. The cubic root of 81760070 is about 434.0240064021.

Adding to 81760070 its reverse (7006718), we get a palindrome (88766788).

The spelling of 81760070 in words is "eighty-one million, seven hundred sixty thousand, seventy".