76891407849 has 9 divisors (see below), whose sum is σ = 111066568509. Its totient is φ = 51260383980.

The previous prime is 76891407839. The next prime is 76891407877. The reversal of 76891407849 is 94870419867.

The square root of 76891407849 is 277293.

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

76891407849 is a `hidden beast` number, since 7 + 68 + 91 + 407 + 84 + 9 = 666.

It is a tau number, because it is divible by the number of its divisors (9).

It is not a de Polignac number, because 76891407849 - 2²¹ = 76889310697 is a prime.

It is not an unprimeable number, because it can be changed into a prime (76891407839) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 785664 + ... + 878094.

Almost surely, 2^76891407849 is an apocalyptic number.

76891407849 is the 277293-rd square number.

76891407849 is the 138647-th centered octagonal number.

It is an amenable number.

76891407849 is a deficient number, since it is larger than the sum of its proper divisors (34175160660).

76891407849 is an frugal number, since it uses more digits than its factorization.

76891407849 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 184868 (or 92434 counting only the distinct ones).

The product of its (nonzero) digits is 24385536, while the sum is 63.

The spelling of 76891407849 in words is "seventy-six billion, eight hundred ninety-one million, four hundred seven thousand, eight hundred forty-nine".