77428943 has 2 divisors, whose sum is σ = 77428944. Its totient is φ = 77428942.

The previous prime is 77428937. The next prime is 77428969. The reversal of 77428943 is 34982477.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 77428943 - 2¹⁰ = 77427919 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 77428894 and 77428903.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (77428903) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38714471 + 38714472.

It is an arithmetic number, because the mean of its divisors is an integer number (38714472).

Almost surely, 2^77428943 is an apocalyptic number.

77428943 is a deficient number, since it is larger than the sum of its proper divisors (1).

77428943 is an equidigital number, since it uses as much as digits as its factorization.

77428943 is an evil number, because the sum of its binary digits is even.

The product of its digits is 338688, while the sum is 44.

The square root of 77428943 is about 8799.3717389368. The cubic root of 77428943 is about 426.2206073018.

The spelling of 77428943 in words is "seventy-seven million, four hundred twenty-eight thousand, nine hundred forty-three".