828640140 has 24 divisors (see below), whose sum is σ = 2320192560. Its totient is φ = 220970688.

The previous prime is 828640117. The next prime is 828640147. The reversal of 828640140 is 41046828.

It is not an unprimeable number, because it can be changed into a prime (828640147) 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, 6905275 + ... + 6905394.

It is an arithmetic number, because the mean of its divisors is an integer number (96674690).

Almost surely, 2^828640140 is an apocalyptic number.

It is an amenable number.

828640140 is an abundant number, since it is smaller than the sum of its proper divisors (1491552420).

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

828640140 is a wasteful number, since it uses less digits than its factorization.

828640140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13810681 (or 13810679 counting only the distinct ones).

The product of its (nonzero) digits is 12288, while the sum is 33.

The square root of 828640140 is about 28786.1101922438. The cubic root of 828640140 is about 939.2661164877.

Adding to 828640140 its reverse (41046828), we get a palindrome (869686968).

The spelling of 828640140 in words is "eight hundred twenty-eight million, six hundred forty thousand, one hundred forty".