81378000 has 320 divisors, whose sum is σ = 320336640. Its totient is φ = 19584000.

The previous prime is 81377993. The next prime is 81378013. The reversal of 81378000 is 87318.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 593932 + ... + 594068.

It is an arithmetic number, because the mean of its divisors is an integer number (1001052).

Almost surely, 2^81378000 is an apocalyptic number.

81378000 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 81378000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (160168320).

81378000 is an abundant number, since it is smaller than the sum of its proper divisors (238958640).

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

81378000 is a wasteful number, since it uses less digits than its factorization.

81378000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 180 (or 158 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 27.

The square root of 81378000 is about 9020.9755570005. The cubic root of 81378000 is about 433.3468766313.

The spelling of 81378000 in words is "eighty-one million, three hundred seventy-eight thousand".