842688621 has 12 divisors (see below), whose sum is σ = 1246905660. Its totient is φ = 548089920.

The previous prime is 842688619. The next prime is 842688643. The reversal of 842688621 is 126886248.

842688621 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 338192100 + 504496521 = 18390^2 + 22461^2 .

It is not a de Polignac number, because 842688621 - 2¹ = 842688619 is a prime.

It is a super-2 number, since 2×842688621² = 1420248223925763282, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (842688611) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1141486 + ... + 1142223.

It is an arithmetic number, because the mean of its divisors is an integer number (103908805).

Almost surely, 2^842688621 is an apocalyptic number.

It is an amenable number.

842688621 is a deficient number, since it is larger than the sum of its proper divisors (404217039).

842688621 is a wasteful number, since it uses less digits than its factorization.

842688621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2283756 (or 2283753 counting only the distinct ones).

The product of its digits is 294912, while the sum is 45.

The square root of 842688621 is about 29029.0995554461. The cubic root of 842688621 is about 944.5443978329.

The spelling of 842688621 in words is "eight hundred forty-two million, six hundred eighty-eight thousand, six hundred twenty-one".