76405081 has 3 divisors (see below), whose sum is σ = 76413823. Its totient is φ = 76396340.

The previous prime is 76405079. The next prime is 76405093. The reversal of 76405081 is 18050467.

The square root of 76405081 is 8741.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 18050467 = 229 ⋅78823.

It can be written as a sum of positive squares in only one way, i.e., 13995081 + 62410000 = 3741^2 + 7900^2 .

It is not a de Polignac number, because 76405081 - 2¹ = 76405079 is a prime.

It is a super-2 number, since 2×76405081² = 11675472805233122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (76405051) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 4371 + ... + 13111.

Almost surely, 2^76405081 is an apocalyptic number.

76405081 is the 8741-st square number.

76405081 is the 4371-st centered octagonal number.

It is an amenable number.

76405081 is a deficient number, since it is larger than the sum of its proper divisors (8742).

76405081 is an frugal number, since it uses more digits than its factorization.

76405081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17482 (or 8741 counting only the distinct ones).

The product of its (nonzero) digits is 6720, while the sum is 31.

The cubic root of 76405081 is about 424.3335918222. Note that the first 3 decimals are identical.

It can be divided in two parts, 7640 and 5081, that added together give a palindrome (12721).

The spelling of 76405081 in words is "seventy-six million, four hundred five thousand, eighty-one".