815402135420 has 24 divisors (see below), whose sum is σ = 1712733044400. Its totient is φ = 326086842752.

The previous prime is 815402135419. The next prime is 815402135459. The reversal of 815402135420 is 24531204518.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4535330 + ... + 4711689.

It is an arithmetic number, because the mean of its divisors is an integer number (71363876850).

Almost surely, 2^815402135420 is an apocalyptic number.

It is an amenable number.

815402135420 is an abundant number, since it is smaller than the sum of its proper divisors (897330908980).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

815402135420 is a wasteful number, since it uses less digits than its factorization.

815402135420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9251437 (or 9251435 counting only the distinct ones).

The product of its (nonzero) digits is 38400, while the sum is 35.

Adding to 815402135420 its reverse (24531204518), we get a palindrome (839933339938).

The spelling of 815402135420 in words is "eight hundred fifteen billion, four hundred two million, one hundred thirty-five thousand, four hundred twenty".