68513536 has 144 divisors (see below), whose sum is σ = 179250624. Its totient is φ = 25362432.

The previous prime is 68513507. The next prime is 68513551. The reversal of 68513536 is 63531586.

68513536 = 699² + 700² + ... + 817².

It is a junction number, because it is equal to n+sod(n) for n = 68513495 and 68513504.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 395946 + ... + 396118.

It is an arithmetic number, because the mean of its divisors is an integer number (1244796).

Almost surely, 2^68513536 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 68513536, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (89625312).

68513536 is an abundant number, since it is smaller than the sum of its proper divisors (110737088).

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

68513536 is a wasteful number, since it uses less digits than its factorization.

68513536 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 226 (or 212 counting only the distinct ones).

The product of its digits is 64800, while the sum is 37.

The square root of 68513536 is about 8277.2903778954. The cubic root of 68513536 is about 409.1904231022.

The spelling of 68513536 in words is "sixty-eight million, five hundred thirteen thousand, five hundred thirty-six".