81434136 has 32 divisors (see below), whose sum is σ = 232669440. Its totient is φ = 23266848.

The previous prime is 81434113. The next prime is 81434137. The reversal of 81434136 is 63143418.

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81434137) 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, 242196 + ... + 242531.

It is an arithmetic number, because the mean of its divisors is an integer number (7270920).

Almost surely, 2^81434136 is an apocalyptic number.

It is an amenable number.

81434136 is an abundant number, since it is smaller than the sum of its proper divisors (151235304).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81434136 is a wasteful number, since it uses less digits than its factorization.

81434136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 484743 (or 484739 counting only the distinct ones).

The product of its digits is 6912, while the sum is 30.

The square root of 81434136 is about 9024.0864357563. The cubic root of 81434136 is about 433.4464972037.

The spelling of 81434136 in words is "eighty-one million, four hundred thirty-four thousand, one hundred thirty-six".