70978997 has 2 divisors, whose sum is σ = 70978998. Its totient is φ = 70978996.

The previous prime is 70978993. The next prime is 70979009. The reversal of 70978997 is 79987907.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 64224196 + 6754801 = 8014^2 + 2599^2 .

It is a cyclic number.

It is not a de Polignac number, because 70978997 - 2² = 70978993 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (70978991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35489498 + 35489499.

It is an arithmetic number, because the mean of its divisors is an integer number (35489499).

Almost surely, 2^70978997 is an apocalyptic number.

It is an amenable number.

70978997 is a deficient number, since it is larger than the sum of its proper divisors (1).

70978997 is an equidigital number, since it uses as much as digits as its factorization.

70978997 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2000376, while the sum is 56.

The square root of 70978997 is about 8424.9033822353. The cubic root of 70978997 is about 414.0409401196.

The spelling of 70978997 in words is "seventy million, nine hundred seventy-eight thousand, nine hundred ninety-seven".