81629262000 has 1440 divisors, whose sum is σ = 357663983040. Its totient is φ = 17677440000.

The previous prime is 81629261999. The next prime is 81629262017. The reversal of 81629262000 is 26292618.

It is a happy number.

81629262000 is a `hidden beast` number, since 8 + 1 + 6 + 29 + 2 + 620 + 0 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 287 ways as a sum of consecutive naturals, for example, 2633201985 + ... + 2633202015.

It is an arithmetic number, because the mean of its divisors is an integer number (248377766).

Almost surely, 2^81629262000 is an apocalyptic number.

81629262000 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 81629262000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (178831991520).

81629262000 is an abundant number, since it is smaller than the sum of its proper divisors (276034721040).

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

81629262000 is a wasteful number, since it uses less digits than its factorization.

81629262000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129 (or 65 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 36.

The spelling of 81629262000 in words is "eighty-one billion, six hundred twenty-nine million, two hundred sixty-two thousand".