81603480 has 128 divisors (see below), whose sum is σ = 294566400. Its totient is φ = 17667072.

The previous prime is 81603479. The next prime is 81603493. The reversal of 81603480 is 8430618.

It is a happy number.

It is a super-2 number, since 2×81603480² = 13318255896220800, which contains 22 as substring.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 13404 + ... + 18516.

It is an arithmetic number, because the mean of its divisors is an integer number (2301300).

Almost surely, 2^81603480 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81603480, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (147283200).

81603480 is an abundant number, since it is smaller than the sum of its proper divisors (212962920).

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

81603480 is a wasteful number, since it uses less digits than its factorization.

81603480 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5153 (or 5149 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 30.

The square root of 81603480 is about 9033.4644516929. The cubic root of 81603480 is about 433.7467428824.

The spelling of 81603480 in words is "eighty-one million, six hundred three thousand, four hundred eighty".