81378298 has 8 divisors (see below), whose sum is σ = 123028992. Its totient is φ = 40368636.

The previous prime is 81378289. The next prime is 81378299. The reversal of 81378298 is 89287318.

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

It is not an unprimeable number, because it can be changed into a prime (81378299) 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, 159940 + ... + 160447.

It is an arithmetic number, because the mean of its divisors is an integer number (15378624).

Almost surely, 2^81378298 is an apocalyptic number.

81378298 is a deficient number, since it is larger than the sum of its proper divisors (41650694).

81378298 is a wasteful number, since it uses less digits than its factorization.

81378298 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 320516.

The product of its digits is 193536, while the sum is 46.

The square root of 81378298 is about 9020.9920740460. The cubic root of 81378298 is about 433.3474055917.

The spelling of 81378298 in words is "eighty-one million, three hundred seventy-eight thousand, two hundred ninety-eight".