1523106640 has 80 divisors (see below), whose sum is σ = 3878430336. Its totient is φ = 551667200.

The previous prime is 1523106631. The next prime is 1523106647. The reversal of 1523106640 is 466013251.

It is a tau number, because it is divible by the number of its divisors (80).

It is a junction number, because it is equal to n+sod(n) for n = 1523106599 and 1523106608.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1523106647) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 228150 + ... + 234730.

Almost surely, 2^1523106640 is an apocalyptic number.

1523106640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1523106640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1939215168).

1523106640 is an abundant number, since it is smaller than the sum of its proper divisors (2355323696).

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

1523106640 is a wasteful number, since it uses less digits than its factorization.

1523106640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6868 (or 6862 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 28.

The square root of 1523106640 is about 39026.9988597637. The cubic root of 1523106640 is about 1150.5622052588.

Adding to 1523106640 its reverse (466013251), we get a palindrome (1989119891).

The spelling of 1523106640 in words is "one billion, five hundred twenty-three million, one hundred six thousand, six hundred forty".