78900529 has 2 divisors, whose sum is σ = 78900530. Its totient is φ = 78900528.

The previous prime is 78900499. The next prime is 78900541. The reversal of 78900529 is 92500987.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 73068304 + 5832225 = 8548^2 + 2415^2 .

It is a cyclic number.

It is not a de Polignac number, because 78900529 - 2¹¹ = 78898481 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 78900491 and 78900500.

It is not a weakly prime, because it can be changed into another prime (78900589) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39450264 + 39450265.

It is an arithmetic number, because the mean of its divisors is an integer number (39450265).

Almost surely, 2^78900529 is an apocalyptic number.

It is an amenable number.

78900529 is a deficient number, since it is larger than the sum of its proper divisors (1).

78900529 is an equidigital number, since it uses as much as digits as its factorization.

78900529 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 45360, while the sum is 40.

The square root of 78900529 is about 8882.5969738585. The cubic root of 78900529 is about 428.9038766894.

The spelling of 78900529 in words is "seventy-eight million, nine hundred thousand, five hundred twenty-nine".