70731779 has 2 divisors, whose sum is σ = 70731780. Its totient is φ = 70731778.

The previous prime is 70731769. The next prime is 70731799. The reversal of 70731779 is 97713707.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 70731779 - 2⁸ = 70731523 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (70731719) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35365889 + 35365890.

It is an arithmetic number, because the mean of its divisors is an integer number (35365890).

Almost surely, 2^70731779 is an apocalyptic number.

70731779 is a deficient number, since it is larger than the sum of its proper divisors (1).

70731779 is an equidigital number, since it uses as much as digits as its factorization.

70731779 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 64827, while the sum is 41.

The square root of 70731779 is about 8410.2187248608. The cubic root of 70731779 is about 413.5596830101.

The spelling of 70731779 in words is "seventy million, seven hundred thirty-one thousand, seven hundred seventy-nine".