76646021 has 2 divisors, whose sum is σ = 76646022. Its totient is φ = 76646020.

The previous prime is 76645973. The next prime is 76646027. The reversal of 76646021 is 12064667.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 76562500 + 83521 = 8750^2 + 289^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-76646021 is a prime.

It is a super-2 number, since 2×76646021² = 11749225070264882, which contains 22 as substring.

It is equal to p_4485047 and since 76646021 and 4485047 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (76646027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38323010 + 38323011.

It is an arithmetic number, because the mean of its divisors is an integer number (38323011).

Almost surely, 2^76646021 is an apocalyptic number.

It is an amenable number.

76646021 is a deficient number, since it is larger than the sum of its proper divisors (1).

76646021 is an equidigital number, since it uses as much as digits as its factorization.

76646021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12096, while the sum is 32.

The square root of 76646021 is about 8754.7713276818. The cubic root of 76646021 is about 424.7791627778.

The spelling of 76646021 in words is "seventy-six million, six hundred forty-six thousand, twenty-one".