81700263 has 6 divisors (see below), whose sum is σ = 118011504. Its totient is φ = 54466836.

The previous prime is 81700253. The next prime is 81700271. The reversal of 81700263 is 36200718.

It is not a de Polignac number, because 81700263 - 2⁵ = 81700231 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81700253) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4538895 + ... + 4538912.

It is an arithmetic number, because the mean of its divisors is an integer number (19668584).

Almost surely, 2^81700263 is an apocalyptic number.

81700263 is a deficient number, since it is larger than the sum of its proper divisors (36311241).

81700263 is a wasteful number, since it uses less digits than its factorization.

81700263 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9077813 (or 9077810 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 27.

The square root of 81700263 is about 9038.8197791526. The cubic root of 81700263 is about 433.9181519362.

The spelling of 81700263 in words is "eighty-one million, seven hundred thousand, two hundred sixty-three".