68539624 has 8 divisors (see below), whose sum is σ = 128511810. Its totient is φ = 34269808.

The previous prime is 68539621. The next prime is 68539643. The reversal of 68539624 is 42693586.

It can be written as a sum of positive squares in only one way, i.e., 39917124 + 28622500 = 6318^2 + 5350^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×68539624² = 9395360116122752, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (68539621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4283719 + ... + 4283734.

Almost surely, 2^68539624 is an apocalyptic number.

It is an amenable number.

68539624 is a deficient number, since it is larger than the sum of its proper divisors (59972186).

68539624 is a wasteful number, since it uses less digits than its factorization.

68539624 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8567459 (or 8567455 counting only the distinct ones).

The product of its digits is 311040, while the sum is 43.

The square root of 68539624 is about 8278.8661059350. The cubic root of 68539624 is about 409.2423525251.

The spelling of 68539624 in words is "sixty-eight million, five hundred thirty-nine thousand, six hundred twenty-four".