70879999 has 2 divisors, whose sum is σ = 70880000. Its totient is φ = 70879998.

The previous prime is 70879993. The next prime is 70880057. The reversal of 70879999 is 99997807.

It is an a-pointer prime, because the next prime (70880057) can be obtained adding 70879999 to its sum of digits (58).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 70879999 - 2⁵ = 70879967 is a prime.

It is a Chen prime.

70879999 is a modest number, since divided by 9999 gives 7087 as remainder.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (70879993) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35439999 + 35440000.

It is an arithmetic number, because the mean of its divisors is an integer number (35440000).

Almost surely, 2^70879999 is an apocalyptic number.

70879999 is a deficient number, since it is larger than the sum of its proper divisors (1).

70879999 is an equidigital number, since it uses as much as digits as its factorization.

70879999 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2571912, while the sum is 58.

The square root of 70879999 is about 8419.0260125504. The cubic root of 70879999 is about 413.8483559370.

The spelling of 70879999 in words is "seventy million, eight hundred seventy-nine thousand, nine hundred ninety-nine".