77428759 has 2 divisors, whose sum is σ = 77428760. Its totient is φ = 77428758.

The previous prime is 77428717. The next prime is 77428763. The reversal of 77428759 is 95782477.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 77428759 - 2¹⁵ = 77395991 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (77428159) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38714379 + 38714380.

It is an arithmetic number, because the mean of its divisors is an integer number (38714380).

Almost surely, 2^77428759 is an apocalyptic number.

77428759 is a deficient number, since it is larger than the sum of its proper divisors (1).

77428759 is an equidigital number, since it uses as much as digits as its factorization.

77428759 is an evil number, because the sum of its binary digits is even.

The product of its digits is 987840, while the sum is 49.

The square root of 77428759 is about 8799.3612836387. The cubic root of 77428759 is about 426.2202696819.

It can be divided in two parts, 77428 and 759, that added together give a palindrome (78187).

The spelling of 77428759 in words is "seventy-seven million, four hundred twenty-eight thousand, seven hundred fifty-nine".