730620857 has 2 divisors, whose sum is σ = 730620858. Its totient is φ = 730620856.

The previous prime is 730620853. The next prime is 730620911. The reversal of 730620857 is 758026037.

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., 431642176 + 298978681 = 20776^2 + 17291^2 .

It is a cyclic number.

It is not a de Polignac number, because 730620857 - 2² = 730620853 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 730620857.

It is not a weakly prime, because it can be changed into another prime (730620853) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 365310428 + 365310429.

It is an arithmetic number, because the mean of its divisors is an integer number (365310429).

Almost surely, 2^730620857 is an apocalyptic number.

It is an amenable number.

730620857 is a deficient number, since it is larger than the sum of its proper divisors (1).

730620857 is an equidigital number, since it uses as much as digits as its factorization.

730620857 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 70560, while the sum is 38.

The square root of 730620857 is about 27029.9992045875. Note that the first 3 decimals coincide. The cubic root of 730620857 is about 900.6665256015. Note that the first 3 decimals are identical.

The spelling of 730620857 in words is "seven hundred thirty million, six hundred twenty thousand, eight hundred fifty-seven".