68481537 has 4 divisors (see below), whose sum is σ = 91308720. Its totient is φ = 45654356.

The previous prime is 68481493. The next prime is 68481541. The reversal of 68481537 is 73518486.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 68481537 - 2⁷ = 68481409 is a prime.

It is not an unprimeable number, because it can be changed into a prime (68481037) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11413587 + ... + 11413592.

It is an arithmetic number, because the mean of its divisors is an integer number (22827180).

Almost surely, 2^68481537 is an apocalyptic number.

It is an amenable number.

68481537 is a deficient number, since it is larger than the sum of its proper divisors (22827183).

68481537 is a wasteful number, since it uses less digits than its factorization.

68481537 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22827182.

The product of its digits is 161280, while the sum is 42.

The square root of 68481537 is about 8275.3572128338. The cubic root of 68481537 is about 409.1267095448.

It can be divided in two parts, 6848 and 1537, that added together give a triangular number (8385 = T₁₂₉).

The spelling of 68481537 in words is "sixty-eight million, four hundred eighty-one thousand, five hundred thirty-seven".