77620889 has 2 divisors, whose sum is σ = 77620890. Its totient is φ = 77620888.

The previous prime is 77620877. The next prime is 77620951. The reversal of 77620889 is 98802677.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 76825225 + 795664 = 8765^2 + 892^2 .

It is a cyclic number.

It is not a de Polignac number, because 77620889 - 2¹² = 77616793 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (77620819) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38810444 + 38810445.

It is an arithmetic number, because the mean of its divisors is an integer number (38810445).

Almost surely, 2^77620889 is an apocalyptic number.

It is an amenable number.

77620889 is a deficient number, since it is larger than the sum of its proper divisors (1).

77620889 is an equidigital number, since it uses as much as digits as its factorization.

77620889 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 338688, while the sum is 47.

The square root of 77620889 is about 8810.2717892242. The cubic root of 77620889 is about 426.5725163217.

The spelling of 77620889 in words is "seventy-seven million, six hundred twenty thousand, eight hundred eighty-nine".