77206889 has 2 divisors, whose sum is σ = 77206890. Its totient is φ = 77206888.

The previous prime is 77206841. The next prime is 77206919. The reversal of 77206889 is 98860277.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 46348864 + 30858025 = 6808^2 + 5555^2 .

It is an emirp because it is prime and its reverse (98860277) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 77206889 - 2¹² = 77202793 is a prime.

It is not a weakly prime, because it can be changed into another prime (77206819) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38603444 + 38603445.

It is an arithmetic number, because the mean of its divisors is an integer number (38603445).

Almost surely, 2^77206889 is an apocalyptic number.

It is an amenable number.

77206889 is a deficient number, since it is larger than the sum of its proper divisors (1).

77206889 is an equidigital number, since it uses as much as digits as its factorization.

77206889 is an evil number, because the sum of its binary digits is even.

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

The square root of 77206889 is about 8786.7450742582. The cubic root of 77206889 is about 425.8127726852.

The spelling of 77206889 in words is "seventy-seven million, two hundred six thousand, eight hundred eighty-nine".