70890505 has 12 divisors (see below), whose sum is σ = 98957700. Its totient is φ = 48610464.

The previous prime is 70890503. The next prime is 70890551. The reversal of 70890505 is 50509807.

It can be written as a sum of positive squares in 2 ways, for example, as 38900169 + 31990336 = 6237^2 + 5656^2 .

It is not a de Polignac number, because 70890505 - 2¹ = 70890503 is a prime.

It is not an unprimeable number, because it can be changed into a prime (70890503) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 144430 + ... + 144919.

It is an arithmetic number, because the mean of its divisors is an integer number (8246475).

Almost surely, 2^70890505 is an apocalyptic number.

It is an amenable number.

70890505 is a deficient number, since it is larger than the sum of its proper divisors (28067195).

70890505 is a wasteful number, since it uses less digits than its factorization.

70890505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 289368 (or 289361 counting only the distinct ones).

The product of its (nonzero) digits is 12600, while the sum is 34.

The square root of 70890505 is about 8419.6499333405. The cubic root of 70890505 is about 413.8688021188.

The spelling of 70890505 in words is "seventy million, eight hundred ninety thousand, five hundred five".