81452776 has 8 divisors (see below), whose sum is σ = 152723970. Its totient is φ = 40726384.

The previous prime is 81452741. The next prime is 81452801. The reversal of 81452776 is 67725418.

It can be written as a sum of positive squares in only one way, i.e., 58890276 + 22562500 = 7674^2 + 4750^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5090791 + ... + 5090806.

Almost surely, 2^81452776 is an apocalyptic number.

It is an amenable number.

81452776 is a deficient number, since it is larger than the sum of its proper divisors (71271194).

81452776 is a wasteful number, since it uses less digits than its factorization.

81452776 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10181603 (or 10181599 counting only the distinct ones).

The product of its digits is 94080, while the sum is 40.

The square root of 81452776 is about 9025.1191681883. The cubic root of 81452776 is about 433.4795661628.

It can be divided in two parts, 81452 and 776, that added together give a palindrome (82228).

The spelling of 81452776 in words is "eighty-one million, four hundred fifty-two thousand, seven hundred seventy-six".