81603264 has 112 divisors (see below), whose sum is σ = 238768128. Its totient is φ = 24465408.

The previous prime is 81603257. The next prime is 81603317. The reversal of 81603264 is 46230618.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 74529 + ... + 75615.

Almost surely, 2^81603264 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 81603264, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (119384064).

81603264 is an abundant number, since it is smaller than the sum of its proper divisors (157164864).

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

81603264 is a wasteful number, since it uses less digits than its factorization.

81603264 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1142 (or 1132 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 30.

The square root of 81603264 is about 9033.4524961390. The cubic root of 81603264 is about 433.7463601806.

The spelling of 81603264 in words is "eighty-one million, six hundred three thousand, two hundred sixty-four".