81917364 has 24 divisors (see below), whose sum is σ = 191909088. Its totient is φ = 27196000.

The previous prime is 81917357. The next prime is 81917387. The reversal of 81917364 is 46371918.

It is a hoax number, since the sum of its digits (39) coincides with the sum of the digits of its distinct prime factors.

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, 10587 + ... + 16610.

It is an arithmetic number, because the mean of its divisors is an integer number (7996212).

Almost surely, 2^81917364 is an apocalyptic number.

It is an amenable number.

81917364 is an abundant number, since it is smaller than the sum of its proper divisors (109991724).

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

81917364 is a wasteful number, since it uses less digits than its factorization.

81917364 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27455 (or 27453 counting only the distinct ones).

The product of its digits is 36288, while the sum is 39.

The square root of 81917364 is about 9050.8211782136. The cubic root of 81917364 is about 434.3021602687.

The spelling of 81917364 in words is "eighty-one million, nine hundred seventeen thousand, three hundred sixty-four".