81634203 has 64 divisors (see below), whose sum is σ = 147456000. Its totient is φ = 43600032.

The previous prime is 81634181. The next prime is 81634213. The reversal of 81634203 is 30243618.

It is a happy number.

81634203 is a `hidden beast` number, since 8 + 1 + 634 + 20 + 3 = 666.

It is not a de Polignac number, because 81634203 - 2⁶ = 81634139 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (81634213) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 455968 + ... + 456146.

It is an arithmetic number, because the mean of its divisors is an integer number (2304000).

Almost surely, 2^81634203 is an apocalyptic number.

81634203 is a deficient number, since it is larger than the sum of its proper divisors (65821797).

81634203 is a wasteful number, since it uses less digits than its factorization.

81634203 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 341 (or 335 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 27.

The square root of 81634203 is about 9035.1648020388. The cubic root of 81634203 is about 433.8011700104.

The spelling of 81634203 in words is "eighty-one million, six hundred thirty-four thousand, two hundred three".