70605781 has 2 divisors, whose sum is σ = 70605782. Its totient is φ = 70605780.

The previous prime is 70605751. The next prime is 70605803. The reversal of 70605781 is 18750607.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 64802500 + 5803281 = 8050^2 + 2409^2 .

It is a cyclic number.

It is not a de Polignac number, because 70605781 - 2¹⁹ = 70081493 is a prime.

It is a super-2 number, since 2×70605781² = 9970352621239922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (70605721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35302890 + 35302891.

It is an arithmetic number, because the mean of its divisors is an integer number (35302891).

Almost surely, 2^70605781 is an apocalyptic number.

It is an amenable number.

70605781 is a deficient number, since it is larger than the sum of its proper divisors (1).

70605781 is an equidigital number, since it uses as much as digits as its factorization.

70605781 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11760, while the sum is 34.

The square root of 70605781 is about 8402.7246176464. The cubic root of 70605781 is about 413.3139723126.

The spelling of 70605781 in words is "seventy million, six hundred five thousand, seven hundred eighty-one".