68779540 has 24 divisors (see below), whose sum is σ = 144668160. Its totient is φ = 27467808.

The previous prime is 68779537. The next prime is 68779549. The reversal of 68779540 is 4597786.

It is a happy number.

It is a super-2 number, since 2×68779540² = 9461250245223200, which contains 22 as substring.

It is a hoax number, since the sum of its digits (46) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68779549) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11989 + ... + 16771.

It is an arithmetic number, because the mean of its divisors is an integer number (6027840).

Almost surely, 2^68779540 is an apocalyptic number.

It is an amenable number.

68779540 is an abundant number, since it is smaller than the sum of its proper divisors (75888620).

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

68779540 is a wasteful number, since it uses less digits than its factorization.

68779540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5511 (or 5509 counting only the distinct ones).

The product of its (nonzero) digits is 423360, while the sum is 46.

The square root of 68779540 is about 8293.3431136062. The cubic root of 68779540 is about 409.7193002330.

The spelling of 68779540 in words is "sixty-eight million, seven hundred seventy-nine thousand, five hundred forty".