81162632 has 8 divisors (see below), whose sum is σ = 152179950. Its totient is φ = 40581312.

The previous prime is 81162611. The next prime is 81162637. The reversal of 81162632 is 23626118.

It can be written as a sum of positive squares in only one way, i.e., 75238276 + 5924356 = 8674^2 + 2434^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a junction number, because it is equal to n+sod(n) for n = 81162595 and 81162604.

It is not an unprimeable number, because it can be changed into a prime (81162637) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5072657 + ... + 5072672.

Almost surely, 2^81162632 is an apocalyptic number.

It is an amenable number.

81162632 is a deficient number, since it is larger than the sum of its proper divisors (71017318).

81162632 is a wasteful number, since it uses less digits than its factorization.

81162632 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10145335 (or 10145331 counting only the distinct ones).

The product of its digits is 3456, while the sum is 29.

The square root of 81162632 is about 9009.0305804787. The cubic root of 81162632 is about 432.9642527297.

The spelling of 81162632 in words is "eighty-one million, one hundred sixty-two thousand, six hundred thirty-two".