76428109 has 2 divisors, whose sum is σ = 76428110. Its totient is φ = 76428108.

The previous prime is 76428097. The next prime is 76428161. The reversal of 76428109 is 90182467.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 64352484 + 12075625 = 8022^2 + 3475^2 .

It is a cyclic number.

It is not a de Polignac number, because 76428109 - 2²¹ = 74330957 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (76428409) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38214054 + 38214055.

It is an arithmetic number, because the mean of its divisors is an integer number (38214055).

Almost surely, 2^76428109 is an apocalyptic number.

It is an amenable number.

76428109 is a deficient number, since it is larger than the sum of its proper divisors (1).

76428109 is an equidigital number, since it uses as much as digits as its factorization.

76428109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 24192, while the sum is 37.

The square root of 76428109 is about 8742.3171413533. The cubic root of 76428109 is about 424.3762180118.

It can be divided in two parts, 7642 and 8109, that added together give a palindrome (15751).

The spelling of 76428109 in words is "seventy-six million, four hundred twenty-eight thousand, one hundred nine".