81630848 has 32 divisors (see below), whose sum is σ = 175137060. Its totient is φ = 37675008.

The previous prime is 81630839. The next prime is 81630881. The reversal of 81630848 is 84803618.

It can be written as a sum of positive squares in 2 ways, for example, as 81577024 + 53824 = 9032^2 + 232^2 .

It is a tau number, because it is divible by the number of its divisors (32).

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, 22865 + ... + 26192.

Almost surely, 2^81630848 is an apocalyptic number.

It is an amenable number.

81630848 is an abundant number, since it is smaller than the sum of its proper divisors (93506212).

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

81630848 is a wasteful number, since it uses less digits than its factorization.

81630848 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49084 (or 49072 counting only the distinct ones).

The product of its (nonzero) digits is 36864, while the sum is 38.

The square root of 81630848 is about 9034.9791366666. The cubic root of 81630848 is about 433.7952271465.

The spelling of 81630848 in words is "eighty-one million, six hundred thirty thousand, eight hundred forty-eight".