77923589 has 2 divisors, whose sum is σ = 77923590. Its totient is φ = 77923588.

The previous prime is 77923583. The next prime is 77923619. The reversal of 77923589 is 98532977.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 76702564 + 1221025 = 8758^2 + 1105^2 .

It is an emirp because it is prime and its reverse (98532977) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 77923589 - 2¹² = 77919493 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (77923583) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38961794 + 38961795.

It is an arithmetic number, because the mean of its divisors is an integer number (38961795).

Almost surely, 2^77923589 is an apocalyptic number.

It is an amenable number.

77923589 is a deficient number, since it is larger than the sum of its proper divisors (1).

77923589 is an equidigital number, since it uses as much as digits as its factorization.

77923589 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 952560, while the sum is 50.

The square root of 77923589 is about 8827.4338853372. The cubic root of 77923589 is about 427.1263020204.

The spelling of 77923589 in words is "seventy-seven million, nine hundred twenty-three thousand, five hundred eighty-nine".