81264450 has 24 divisors (see below), whose sum is σ = 201536208. Its totient is φ = 21670480.

The previous prime is 81264439. The next prime is 81264461. The reversal of 81264450 is 5446218.

It is an interprime number because it is at equal distance from previous prime (81264439) and next prime (81264461).

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 270732 + ... + 271031.

It is an arithmetic number, because the mean of its divisors is an integer number (8397342).

Almost surely, 2^81264450 is an apocalyptic number.

81264450 is an abundant number, since it is smaller than the sum of its proper divisors (120271758).

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

81264450 is a wasteful number, since it uses less digits than its factorization.

81264450 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 541778 (or 541773 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 30.

The square root of 81264450 is about 9014.6796948089. The cubic root of 81264450 is about 433.1452273640.

The spelling of 81264450 in words is "eighty-one million, two hundred sixty-four thousand, four hundred fifty".