81714729600 has 1152 divisors, whose sum is σ = 357641930880. Its totient is φ = 17340825600.

The previous prime is 81714729587. The next prime is 81714729611. The reversal of 81714729600 is 692741718.

It is a happy number.

81714729600 is a `hidden beast` number, since 8 + 1 + 7 + 14 + 7 + 29 + 600 = 666.

It is a tau number, because it is divible by the number of its divisors (1152).

It is a super-2 number, since 2×81714729600² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 387273495 + ... + 387273705.

It is an arithmetic number, because the mean of its divisors is an integer number (310453065).

Almost surely, 2^81714729600 is an apocalyptic number.

81714729600 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81714729600, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (178820965440).

81714729600 is an abundant number, since it is smaller than the sum of its proper divisors (275927201280).

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

81714729600 is a wasteful number, since it uses less digits than its factorization.

81714729600 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 378 (or 358 counting only the distinct ones).

The product of its (nonzero) digits is 169344, while the sum is 45.

The spelling of 81714729600 in words is "eighty-one billion, seven hundred fourteen million, seven hundred twenty-nine thousand, six hundred".