81378148 has 12 divisors (see below), whose sum is σ = 144746812. Its totient is φ = 40021920.

The previous prime is 81378091. The next prime is 81378151. The reversal of 81378148 is 84187318.

It can be written as a sum of positive squares in 2 ways, for example, as 1954404 + 79423744 = 1398^2 + 8912^2 .

It is a super-3 number, since 3×81378148³ (a number of 25 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 81378148.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 166515 + ... + 167002.

Almost surely, 2^81378148 is an apocalyptic number.

It is an amenable number.

81378148 is a deficient number, since it is larger than the sum of its proper divisors (63368664).

81378148 is a wasteful number, since it uses less digits than its factorization.

81378148 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 333582 (or 333580 counting only the distinct ones).

The product of its digits is 43008, while the sum is 40.

The square root of 81378148 is about 9020.9837601007. The cubic root of 81378148 is about 433.3471393366.

It can be divided in two parts, 813 and 78148, that added together give a square (78961 = 281²).

The spelling of 81378148 in words is "eighty-one million, three hundred seventy-eight thousand, one hundred forty-eight".