70887913 has 2 divisors, whose sum is σ = 70887914. Its totient is φ = 70887912.

The previous prime is 70887907. The next prime is 70887941. The reversal of 70887913 is 31978807.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 44796249 + 26091664 = 6693^2 + 5108^2 .

It is a cyclic number.

It is not a de Polignac number, because 70887913 - 2¹⁷ = 70756841 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 70887913.

It is not a weakly prime, because it can be changed into another prime (70887983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35443956 + 35443957.

It is an arithmetic number, because the mean of its divisors is an integer number (35443957).

Almost surely, 2^70887913 is an apocalyptic number.

It is an amenable number.

70887913 is a deficient number, since it is larger than the sum of its proper divisors (1).

70887913 is an equidigital number, since it uses as much as digits as its factorization.

70887913 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 84672, while the sum is 43.

The square root of 70887913 is about 8419.4960062940. The cubic root of 70887913 is about 413.8637579030.

The spelling of 70887913 in words is "seventy million, eight hundred eighty-seven thousand, nine hundred thirteen".