81903378 has 8 divisors (see below), whose sum is σ = 163806768. Its totient is φ = 27301124.

The previous prime is 81903377. The next prime is 81903383. The reversal of 81903378 is 87330918.

It is a sphenic number, since it is the product of 3 distinct primes.

81903378 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (81903377) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6825276 + ... + 6825287.

It is an arithmetic number, because the mean of its divisors is an integer number (20475846).

Almost surely, 2^81903378 is an apocalyptic number.

81903378 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

81903378 is a wasteful number, since it uses less digits than its factorization.

81903378 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13650568.

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

The square root of 81903378 is about 9050.0485081573. The cubic root of 81903378 is about 434.2774422870.

The spelling of 81903378 in words is "eighty-one million, nine hundred three thousand, three hundred seventy-eight".