81078160 has 20 divisors (see below), whose sum is σ = 188506908. Its totient is φ = 32431232.

The previous prime is 81078143. The next prime is 81078161. The reversal of 81078160 is 6187018.

It can be written as a sum of positive squares in 2 ways, for example, as 9709456 + 71368704 = 3116^2 + 8448^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is not an unprimeable number, because it can be changed into a prime (81078161) 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, 506659 + ... + 506818.

Almost surely, 2^81078160 is an apocalyptic number.

81078160 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

81078160 is an abundant number, since it is smaller than the sum of its proper divisors (107428748).

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

81078160 is a wasteful number, since it uses less digits than its factorization.

81078160 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1013490 (or 1013484 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 31.

The square root of 81078160 is about 9004.3411752332. The cubic root of 81078160 is about 432.8139945341.

The spelling of 81078160 in words is "eighty-one million, seventy-eight thousand, one hundred sixty".