81471888 has 120 divisors (see below), whose sum is σ = 252091008. Its totient is φ = 24431616.

The previous prime is 81471883. The next prime is 81471893. The reversal of 81471888 is 88817418.

It is an interprime number because it is at equal distance from previous prime (81471883) and next prime (81471893).

It is not an unprimeable number, because it can be changed into a prime (81471883) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 55581 + ... + 57027.

Almost surely, 2^81471888 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81471888, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (126045504).

81471888 is an abundant number, since it is smaller than the sum of its proper divisors (170619120).

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

81471888 is a wasteful number, since it uses less digits than its factorization.

81471888 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1501 (or 1492 counting only the distinct ones).

The product of its digits is 114688, while the sum is 45.

The square root of 81471888 is about 9026.1779286695. The cubic root of 81471888 is about 433.5134672524.

It can be divided in two parts, 81 and 471888, that added together give a square (471969 = 687²).

The spelling of 81471888 in words is "eighty-one million, four hundred seventy-one thousand, eight hundred eighty-eight".