81803960 has 32 divisors (see below), whose sum is σ = 210353760. Its totient is φ = 28046976.

The previous prime is 81803959. The next prime is 81803971. The reversal of 81803960 is 6930818.

It is a super-3 number, since 3×81803960³ (a number of 25 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a self number, because there is not a number n which added to its sum of digits gives 81803960.

It is a congruent number.

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, 145799 + ... + 146358.

It is an arithmetic number, because the mean of its divisors is an integer number (6573555).

Almost surely, 2^81803960 is an apocalyptic number.

It is an amenable number.

81803960 is an abundant number, since it is smaller than the sum of its proper divisors (128549800).

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

81803960 is a wasteful number, since it uses less digits than its factorization.

81803960 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 292175 (or 292171 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 35.

The square root of 81803960 is about 9044.5541625887. The cubic root of 81803960 is about 434.1016559851.

The spelling of 81803960 in words is "eighty-one million, eight hundred three thousand, nine hundred sixty".