68464840 has 16 divisors (see below), whose sum is σ = 154045980. Its totient is φ = 27385920.

The previous prime is 68464787. The next prime is 68464871. The reversal of 68464840 is 4846486.

It can be written as a sum of positive squares in 2 ways, for example, as 66292164 + 2172676 = 8142^2 + 1474^2 .

It is a Harshad number since it is a multiple of its sum of digits (40), and also a Moran number because the ratio is a prime number: 1711621 = 68464840 / (6 + 8 + 4 + 6 + 4 + 8 + 4 + 0).

It is a junction number, because it is equal to n+sod(n) for n = 68464793 and 68464802.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 855771 + ... + 855850.

Almost surely, 2^68464840 is an apocalyptic number.

It is an amenable number.

68464840 is an abundant number, since it is smaller than the sum of its proper divisors (85581140).

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

68464840 is a wasteful number, since it uses less digits than its factorization.

68464840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1711632 (or 1711628 counting only the distinct ones).

The product of its (nonzero) digits is 147456, while the sum is 40.

The square root of 68464840 is about 8274.3483127072. The cubic root of 68464840 is about 409.0934560859.

The spelling of 68464840 in words is "sixty-eight million, four hundred sixty-four thousand, eight hundred forty".