70722779 has 2 divisors, whose sum is σ = 70722780. Its totient is φ = 70722778.

The previous prime is 70722767. The next prime is 70722781. The reversal of 70722779 is 97722707.

It is a strong prime.

It is an emirp because it is prime and its reverse (97722707) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 70722779 - 2²⁰ = 69674203 is a prime.

It is a super-2 number, since 2×70722779² = 10003422938965682, which contains 22 as substring.

Together with 70722781, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (70722709) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35361389 + 35361390.

It is an arithmetic number, because the mean of its divisors is an integer number (35361390).

Almost surely, 2^70722779 is an apocalyptic number.

70722779 is a deficient number, since it is larger than the sum of its proper divisors (1).

70722779 is an equidigital number, since it uses as much as digits as its factorization.

70722779 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 86436, while the sum is 41.

The square root of 70722779 is about 8409.6836444661. The cubic root of 70722779 is about 413.5421416490.

The spelling of 70722779 in words is "seventy million, seven hundred twenty-two thousand, seven hundred seventy-nine".