68491956 has 48 divisors (see below), whose sum is σ = 174703424. Its totient is φ = 20756736.

The previous prime is 68491949. The next prime is 68491957. The reversal of 68491956 is 65919486.

It is a super-2 number, since 2×68491956² = 9382296073411872, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68491957) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7176 + ... + 13728.

Almost surely, 2^68491956 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 68491956, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (87351712).

68491956 is an abundant number, since it is smaller than the sum of its proper divisors (106211468).

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

68491956 is a wasteful number, since it uses less digits than its factorization.

68491956 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6640 (or 6638 counting only the distinct ones).

The product of its digits is 466560, while the sum is 48.

The square root of 68491956 is about 8275.9867085442. The cubic root of 68491956 is about 409.1474571079.

The spelling of 68491956 in words is "sixty-eight million, four hundred ninety-one thousand, nine hundred fifty-six".