81303960 has 32 divisors (see below), whose sum is σ = 243912240. Its totient is φ = 21681024.

The previous prime is 81303949. The next prime is 81303967. The reversal of 81303960 is 6930318.

It is a super-2 number, since 2×81303960² = 13220667823363200, 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 not an unprimeable number, because it can be changed into a prime (81303967) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 338647 + ... + 338886.

Almost surely, 2^81303960 is an apocalyptic number.

It is an amenable number.

81303960 is an abundant number, since it is smaller than the sum of its proper divisors (162608280).

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

81303960 is a wasteful number, since it uses less digits than its factorization.

81303960 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 677547 (or 677543 counting only the distinct ones).

The product of its (nonzero) digits is 3888, while the sum is 30.

The square root of 81303960 is about 9016.8708541267. The cubic root of 81303960 is about 433.2154130159.

It can be divided in two parts, 8130 and 3960, that added together give a triangular number (12090 = T₁₅₅).

The spelling of 81303960 in words is "eighty-one million, three hundred three thousand, nine hundred sixty".