76642046649 has 27 divisors (see below), whose sum is σ = 128789262693. Its totient is φ = 43792133112.

The previous prime is 76642046647. The next prime is 76642046659. The reversal of 76642046649 is 94664024667.

It is a happy number.

The square root of 76642046649 is 276843.

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

It is not a de Polignac number, because 76642046649 - 2¹ = 76642046647 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 76642046595 and 76642046604.

It is not an unprimeable number, because it can be changed into a prime (76642046647) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 5807112 + ... + 5820294.

Almost surely, 2^76642046649 is an apocalyptic number.

76642046649 is the 276843-rd square number.

76642046649 is the 138422-nd centered octagonal number.

It is an amenable number.

76642046649 is a deficient number, since it is larger than the sum of its proper divisors (52147216044).

76642046649 is an frugal number, since it uses more digits than its factorization.

76642046649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26386 (or 13193 counting only the distinct ones).

The product of its (nonzero) digits is 10450944, while the sum is 54.

The spelling of 76642046649 in words is "seventy-six billion, six hundred forty-two million, forty-six thousand, six hundred forty-nine".