815628869 has 8 divisors (see below), whose sum is σ = 891299808. Its totient is φ = 740211760.

The previous prime is 815628823. The next prime is 815628883. The reversal of 815628869 is 968826518.

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

It is a cyclic number.

It is not a de Polignac number, because 815628869 - 2¹² = 815624773 is a prime.

It is a super-2 number, since 2×815628869² = 1330500903892438322, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 815628869.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (815628889) 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, 56702 + ... + 69615.

It is an arithmetic number, because the mean of its divisors is an integer number (111412476).

Almost surely, 2^815628869 is an apocalyptic number.

It is an amenable number.

815628869 is a deficient number, since it is larger than the sum of its proper divisors (75670939).

815628869 is a wasteful number, since it uses less digits than its factorization.

815628869 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 126915.

The product of its digits is 1658880, while the sum is 53.

The square root of 815628869 is about 28559.2168835212. The cubic root of 815628869 is about 934.3240537600.

The spelling of 815628869 in words is "eight hundred fifteen million, six hundred twenty-eight thousand, eight hundred sixty-nine".