82561450 has 12 divisors (see below), whose sum is σ = 153564390. Its totient is φ = 33024560.

The previous prime is 82561447. The next prime is 82561471. The reversal of 82561450 is 5416528.

It can be written as a sum of positive squares in 3 ways, for example, as 80874049 + 1687401 = 8993^2 + 1299^2 .

It is a super-2 number, since 2×82561450² = 13632786052205000, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 825565 + ... + 825664.

Almost surely, 2^82561450 is an apocalyptic number.

82561450 is a deficient number, since it is larger than the sum of its proper divisors (71002940).

82561450 is a wasteful number, since it uses less digits than its factorization.

82561450 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1651241 (or 1651236 counting only the distinct ones).

The product of its (nonzero) digits is 9600, while the sum is 31.

The square root of 82561450 is about 9086.3331437935. Note that the first 3 decimals coincide. The cubic root of 82561450 is about 435.4374425450.

Adding to 82561450 its reverse (5416528), we get a palindrome (87977978).

The spelling of 82561450 in words is "eighty-two million, five hundred sixty-one thousand, four hundred fifty".