81634029 has 8 divisors (see below), whose sum is σ = 109475232. Its totient is φ = 54107760.

The previous prime is 81634019. The next prime is 81634031. The reversal of 81634029 is 92043618.

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

It is not a de Polignac number, because 81634029 - 2⁷ = 81633901 is a prime.

It is a super-2 number, since 2×81634029² = 13328229381545682, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81634009) 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, 78127 + ... + 79164.

It is an arithmetic number, because the mean of its divisors is an integer number (13684404).

Almost surely, 2^81634029 is an apocalyptic number.

It is an amenable number.

81634029 is a deficient number, since it is larger than the sum of its proper divisors (27841203).

81634029 is a wasteful number, since it uses less digits than its factorization.

81634029 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 157467.

The product of its (nonzero) digits is 10368, while the sum is 33.

The square root of 81634029 is about 9035.1551729896. The cubic root of 81634029 is about 433.8008618003.

The spelling of 81634029 in words is "eighty-one million, six hundred thirty-four thousand, twenty-nine".