1521063684 has 120 divisors (see below), whose sum is σ = 4637494400. Its totient is φ = 434557872.

The previous prime is 1521063683. The next prime is 1521063689. The reversal of 1521063684 is 4863601251.

It is a happy number.

1521063684 is a `hidden beast` number, since 1 + 5 + 2 + 10 + 636 + 8 + 4 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1521063683) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 104289 + ... + 117975.

Almost surely, 2^1521063684 is an apocalyptic number.

1521063684 is a gapful number since it is divisible by the number (14) 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 1521063684, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2318747200).

1521063684 is an abundant number, since it is smaller than the sum of its proper divisors (3116430716).

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

1521063684 is a wasteful number, since it uses less digits than its factorization.

1521063684 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13724 (or 13699 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 36.

The square root of 1521063684 is about 39000.8164529924. The cubic root of 1521063684 is about 1150.0475554373.

The spelling of 1521063684 in words is "one billion, five hundred twenty-one million, sixty-three thousand, six hundred eighty-four".