81434910 has 32 divisors (see below), whose sum is σ = 195864480. Its totient is φ = 21669248.

The previous prime is 81434887. The next prime is 81434921. The reversal of 81434910 is 1943418.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12604 + ... + 17936.

It is an arithmetic number, because the mean of its divisors is an integer number (6120765).

Almost surely, 2^81434910 is an apocalyptic number.

81434910 is an abundant number, since it is smaller than the sum of its proper divisors (114429570).

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

81434910 is a wasteful number, since it uses less digits than its factorization.

81434910 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5852.

The product of its (nonzero) digits is 3456, while the sum is 30.

The square root of 81434910 is about 9024.1293208819. The cubic root of 81434910 is about 433.4478704465.

The spelling of 81434910 in words is "eighty-one million, four hundred thirty-four thousand, nine hundred ten".