81954160 has 20 divisors (see below), whose sum is σ = 190543608. Its totient is φ = 32781632.

The previous prime is 81954109. The next prime is 81954179. The reversal of 81954160 is 6145918.

It is a tau number, because it is divible by the number of its divisors (20).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 512134 + ... + 512293.

Almost surely, 2^81954160 is an apocalyptic number.

81954160 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

81954160 is an abundant number, since it is smaller than the sum of its proper divisors (108589448).

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

81954160 is a wasteful number, since it uses less digits than its factorization.

81954160 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1024440 (or 1024434 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 34.

The square root of 81954160 is about 9052.8536937255. The cubic root of 81954160 is about 434.3671777830.

The spelling of 81954160 in words is "eighty-one million, nine hundred fifty-four thousand, one hundred sixty".