81470976 has 160 divisors (see below), whose sum is σ = 235699200. Its totient is φ = 24944640.

The previous prime is 81470971. The next prime is 81470989. The reversal of 81470976 is 67907418.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81470971) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1380835 + ... + 1380893.

It is an arithmetic number, because the mean of its divisors is an integer number (1473120).

Almost surely, 2^81470976 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 81470976, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (117849600).

81470976 is an abundant number, since it is smaller than the sum of its proper divisors (154228224).

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

81470976 is a wasteful number, since it uses less digits than its factorization.

81470976 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 140 (or 124 counting only the distinct ones).

The product of its (nonzero) digits is 84672, while the sum is 42.

The square root of 81470976 is about 9026.1274088061. The cubic root of 81470976 is about 433.5118496566.

The spelling of 81470976 in words is "eighty-one million, four hundred seventy thousand, nine hundred seventy-six".