70920643 has 2 divisors, whose sum is σ = 70920644. Its totient is φ = 70920642.

The previous prime is 70920599. The next prime is 70920659. The reversal of 70920643 is 34602907.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 70920643 - 2⁹ = 70920131 is a prime.

It is not a weakly prime, because it can be changed into another prime (70920743) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35460321 + 35460322.

It is an arithmetic number, because the mean of its divisors is an integer number (35460322).

Almost surely, 2^70920643 is an apocalyptic number.

70920643 is a deficient number, since it is larger than the sum of its proper divisors (1).

70920643 is an equidigital number, since it uses as much as digits as its factorization.

70920643 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9072, while the sum is 31.

The square root of 70920643 is about 8421.4394850287. The cubic root of 70920643 is about 413.9274437793.

The spelling of 70920643 in words is "seventy million, nine hundred twenty thousand, six hundred forty-three".