70890563 has 4 divisors (see below), whose sum is σ = 71039040. Its totient is φ = 70742088.

The previous prime is 70890553. The next prime is 70890569. The reversal of 70890563 is 36509807.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 36509807 = 887 ⋅41161.

It is a cyclic number.

It is not a de Polignac number, because 70890563 - 2⁶ = 70890499 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (70890569) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 73520 + ... + 74477.

It is an arithmetic number, because the mean of its divisors is an integer number (17759760).

Almost surely, 2^70890563 is an apocalyptic number.

70890563 is a deficient number, since it is larger than the sum of its proper divisors (148477).

70890563 is a wasteful number, since it uses less digits than its factorization.

70890563 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 148476.

The product of its (nonzero) digits is 45360, while the sum is 38.

The square root of 70890563 is about 8419.6533776635. The cubic root of 70890563 is about 413.8689149895.

The spelling of 70890563 in words is "seventy million, eight hundred ninety thousand, five hundred sixty-three".