77452897 has 2 divisors, whose sum is σ = 77452898. Its totient is φ = 77452896.

The previous prime is 77452841. The next prime is 77452919. The reversal of 77452897 is 79825477.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 61842496 + 15610401 = 7864^2 + 3951^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-77452897 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 77452897.

It is not a weakly prime, because it can be changed into another prime (77452097) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38726448 + 38726449.

It is an arithmetic number, because the mean of its divisors is an integer number (38726449).

Almost surely, 2^77452897 is an apocalyptic number.

It is an amenable number.

77452897 is a deficient number, since it is larger than the sum of its proper divisors (1).

77452897 is an equidigital number, since it uses as much as digits as its factorization.

77452897 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 77452897 is about 8800.7327535836. The cubic root of 77452897 is about 426.2645557073.

The spelling of 77452897 in words is "seventy-seven million, four hundred fifty-two thousand, eight hundred ninety-seven".