81053480 has 32 divisors (see below), whose sum is σ = 182817000. Its totient is φ = 32342016.

The previous prime is 81053473. The next prime is 81053503. The reversal of 81053480 is 8435018.

It can be written as a sum of positive squares in 4 ways, for example, as 40170244 + 40883236 = 6338^2 + 6394^2 .

It is a super-2 number, since 2×81053480² = 13139333240220800, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15704 + ... + 20216.

Almost surely, 2^81053480 is an apocalyptic number.

It is an amenable number.

81053480 is an abundant number, since it is smaller than the sum of its proper divisors (101763520).

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

81053480 is a wasteful number, since it uses less digits than its factorization.

81053480 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4973 (or 4969 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 29.

The square root of 81053480 is about 9002.9706208562. The cubic root of 81053480 is about 432.7700742255.

Adding to 81053480 its reverse (8435018), we get a palindrome (89488498).

The spelling of 81053480 in words is "eighty-one million, fifty-three thousand, four hundred eighty".