81434376 has 32 divisors (see below), whose sum is σ = 226207200. Its totient is φ = 27144720.

The previous prime is 81434363. The next prime is 81434411. The reversal of 81434376 is 67343418.

81434376 is nontrivially palindromic in base 7.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 81434376.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 188290 + ... + 188721.

It is an arithmetic number, because the mean of its divisors is an integer number (7068975).

Almost surely, 2^81434376 is an apocalyptic number.

It is an amenable number.

81434376 is an abundant number, since it is smaller than the sum of its proper divisors (144772824).

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

81434376 is a wasteful number, since it uses less digits than its factorization.

81434376 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 377026 (or 377016 counting only the distinct ones).

The product of its digits is 48384, while the sum is 36.

The square root of 81434376 is about 9024.0997334914. The cubic root of 81434376 is about 433.4469230163.

It can be divided in two parts, 81434 and 376, that added together give a triangular number (81810 = T₄₀₄).

The spelling of 81434376 in words is "eighty-one million, four hundred thirty-four thousand, three hundred seventy-six".