81078380 has 12 divisors (see below), whose sum is σ = 170264640. Its totient is φ = 32431344.

The previous prime is 81078343. The next prime is 81078383. The reversal of 81078380 is 8387018.

It is a self number, because there is not a number n which added to its sum of digits gives 81078380.

It is not an unprimeable number, because it can be changed into a prime (81078383) 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, 2026940 + ... + 2026979.

It is an arithmetic number, because the mean of its divisors is an integer number (14188720).

Almost surely, 2^81078380 is an apocalyptic number.

It is an amenable number.

81078380 is an abundant number, since it is smaller than the sum of its proper divisors (89186260).

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

81078380 is a wasteful number, since it uses less digits than its factorization.

81078380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4053928 (or 4053926 counting only the distinct ones).

The product of its (nonzero) digits is 10752, while the sum is 35.

The square root of 81078380 is about 9004.3533915546. The cubic root of 81078380 is about 432.8143860040.

The spelling of 81078380 in words is "eighty-one million, seventy-eight thousand, three hundred eighty".