76772161 has 4 divisors (see below), whose sum is σ = 76826452. Its totient is φ = 76717872.

The previous prime is 76772159. The next prime is 76772167. The reversal of 76772161 is 16127767.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 34000561 + 42771600 = 5831^2 + 6540^2 .

It is a cyclic number.

It is not a de Polignac number, because 76772161 - 2¹ = 76772159 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 76772161.

It is not an unprimeable number, because it can be changed into a prime (76772167) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24966 + ... + 27871.

It is an arithmetic number, because the mean of its divisors is an integer number (19206613).

Almost surely, 2^76772161 is an apocalyptic number.

It is an amenable number.

76772161 is a deficient number, since it is larger than the sum of its proper divisors (54291).

76772161 is a wasteful number, since it uses less digits than its factorization.

76772161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54290.

The product of its digits is 24696, while the sum is 37.

The square root of 76772161 is about 8761.9724377562. The cubic root of 76772161 is about 425.0120614801.

The spelling of 76772161 in words is "seventy-six million, seven hundred seventy-two thousand, one hundred sixty-one".