81446430 has 32 divisors (see below), whose sum is σ = 210508704. Its totient is φ = 20048256.

The previous prime is 81446383. The next prime is 81446461. The reversal of 81446430 is 3464418.

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, 104029 + ... + 104808.

It is an arithmetic number, because the mean of its divisors is an integer number (6578397).

Almost surely, 2^81446430 is an apocalyptic number.

81446430 is an abundant number, since it is smaller than the sum of its proper divisors (129062274).

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

81446430 is a wasteful number, since it uses less digits than its factorization.

81446430 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 208860.

The product of its (nonzero) digits is 9216, while the sum is 30.

The square root of 81446430 is about 9024.7675870351. The cubic root of 81446430 is about 433.4683083808.

The spelling of 81446430 in words is "eighty-one million, four hundred forty-six thousand, four hundred thirty".