68780355 has 32 divisors (see below), whose sum is σ = 126087168. Its totient is φ = 31363200.

The previous prime is 68780333. The next prime is 68780377. The reversal of 68780355 is 55308786.

It is an interprime number because it is at equal distance from previous prime (68780333) and next prime (68780377).

It is not a de Polignac number, because 68780355 - 2¹³ = 68772163 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 68910 + ... + 69900.

It is an arithmetic number, because the mean of its divisors is an integer number (3940224).

Almost surely, 2^68780355 is an apocalyptic number.

68780355 is a deficient number, since it is larger than the sum of its proper divisors (57306813).

68780355 is a wasteful number, since it uses less digits than its factorization.

68780355 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1667.

The product of its (nonzero) digits is 201600, while the sum is 42.

The square root of 68780355 is about 8293.3922492548. The cubic root of 68780355 is about 409.7209185433.

The spelling of 68780355 in words is "sixty-eight million, seven hundred eighty thousand, three hundred fifty-five".