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76642021 is a prime number
BaseRepresentation
bin1001001000101…
…11011011100101
312100012211002101
410210113123211
5124110021041
611334412101
71620306061
oct444273345
9170184071
1076642021
113a298315
1221801031
1312b55b11
14a270aa1
156addb31
hex49176e5

76642021 has 2 divisors, whose sum is σ = 76642022. Its totient is φ = 76642020.

The previous prime is 76642019. The next prime is 76642031. The reversal of 76642021 is 12024667.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 71402500 + 5239521 = 8450^2 + 2289^2 .

It is a cyclic number.

It is not a de Polignac number, because 76642021 - 21 = 76642019 is a prime.

Together with 76642019, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (76642031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38321010 + 38321011.

It is an arithmetic number, because the mean of its divisors is an integer number (38321011).

Almost surely, 276642021 is an apocalyptic number.

76642021 is the 4680-th centered heptagonal number.

It is an amenable number.

76642021 is a deficient number, since it is larger than the sum of its proper divisors (1).

76642021 is an equidigital number, since it uses as much as digits as its factorization.

76642021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4032, while the sum is 28.

The square root of 76642021 is about 8754.5428778435. The cubic root of 76642021 is about 424.7717731956.

Adding to 76642021 its reverse (12024667), we get a palindrome (88666688).

The spelling of 76642021 in words is "seventy-six million, six hundred forty-two thousand, twenty-one".