81504482 has 4 divisors (see below), whose sum is σ = 122256726. Its totient is φ = 40752240.

The previous prime is 81504463. The next prime is 81504491. The reversal of 81504482 is 28440518.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 63856081 + 17648401 = 7991^2 + 4201^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20376119 + ... + 20376122.

Almost surely, 2^81504482 is an apocalyptic number.

81504482 is a deficient number, since it is larger than the sum of its proper divisors (40752244).

81504482 is a wasteful number, since it uses less digits than its factorization.

81504482 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40752243.

The product of its (nonzero) digits is 10240, while the sum is 32.

The square root of 81504482 is about 9027.9832742424. The cubic root of 81504482 is about 433.5712706429.

The spelling of 81504482 in words is "eighty-one million, five hundred four thousand, four hundred eighty-two".