81480464 has 20 divisors (see below), whose sum is σ = 170012556. Its totient is φ = 37606272.

The previous prime is 81480463. The next prime is 81480491. The reversal of 81480464 is 46408418.

It can be written as a sum of positive squares in 2 ways, for example, as 16000000 + 65480464 = 4000^2 + 8092^2 .

It is not an unprimeable number, because it can be changed into a prime (81480463) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 195659 + ... + 196074.

Almost surely, 2^81480464 is an apocalyptic number.

It is an amenable number.

81480464 is an abundant number, since it is smaller than the sum of its proper divisors (88532092).

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

81480464 is a wasteful number, since it uses less digits than its factorization.

81480464 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 391754 (or 391748 counting only the distinct ones).

The product of its (nonzero) digits is 24576, while the sum is 35.

The square root of 81480464 is about 9026.6529788178. The cubic root of 81480464 is about 433.5286777385.

The spelling of 81480464 in words is "eighty-one million, four hundred eighty thousand, four hundred sixty-four".