68691540 has 48 divisors (see below), whose sum is σ = 194983488. Its totient is φ = 18065664.

The previous prime is 68691521. The next prime is 68691541. The reversal of 68691540 is 4519686.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68691541) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3462 + ... + 12221.

It is an arithmetic number, because the mean of its divisors is an integer number (4062156).

Almost surely, 2^68691540 is an apocalyptic number.

68691540 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

68691540 is an abundant number, since it is smaller than the sum of its proper divisors (126291948).

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

68691540 is a wasteful number, since it uses less digits than its factorization.

68691540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15768 (or 15766 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 39.

The square root of 68691540 is about 8288.0359555205. The cubic root of 68691540 is about 409.5444871692.

The spelling of 68691540 in words is "sixty-eight million, six hundred ninety-one thousand, five hundred forty".