870820511 has 8 divisors (see below), whose sum is σ = 958702800. Its totient is φ = 784391040.

The previous prime is 870820499. The next prime is 870820513. The reversal of 870820511 is 115028078.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-870820511 is a prime.

It is a super-2 number, since 2×870820511² = 1516656724756602242, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (870820513) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 361946 + ... + 364343.

It is an arithmetic number, because the mean of its divisors is an integer number (119837850).

Almost surely, 2^870820511 is an apocalyptic number.

870820511 is a deficient number, since it is larger than the sum of its proper divisors (87882289).

870820511 is a wasteful number, since it uses less digits than its factorization.

870820511 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 726409.

The product of its (nonzero) digits is 4480, while the sum is 32.

The square root of 870820511 is about 29509.6680936943. The cubic root of 870820511 is about 954.9402888390.

Adding to 870820511 its reverse (115028078), we get a palindrome (985848589).

The spelling of 870820511 in words is "eight hundred seventy million, eight hundred twenty thousand, five hundred eleven".