81283464 has 24 divisors (see below), whose sum is σ = 220142910. Its totient is φ = 27094464.

The previous prime is 81283441. The next prime is 81283471. The reversal of 81283464 is 46438218.

It can be written as a sum of positive squares in only one way, i.e., 52446564 + 28836900 = 7242^2 + 5370^2 .

It is a tau number, because it is divible by the number of its divisors (24).

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

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

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

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 564397 + ... + 564540.

Almost surely, 2^81283464 is an apocalyptic number.

It is an amenable number.

81283464 is an abundant number, since it is smaller than the sum of its proper divisors (138859446).

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

81283464 is a wasteful number, since it uses less digits than its factorization.

81283464 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1128949 (or 1128942 counting only the distinct ones).

The product of its digits is 36864, while the sum is 36.

The square root of 81283464 is about 9015.7342463052. The cubic root of 81283464 is about 433.1790067149.

The spelling of 81283464 in words is "eighty-one million, two hundred eighty-three thousand, four hundred sixty-four".