67768155 has 144 divisors (see below), whose sum is σ = 155301120. Its totient is φ = 26687232.

The previous prime is 67768153. The next prime is 67768187. The reversal of 67768155 is 55186776.

It is not a de Polignac number, because 67768155 - 2¹ = 67768153 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 67768155.

It is not an unprimeable number, because it can be changed into a prime (67768153) by changing a digit.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 1011432 + ... + 1011498.

It is an arithmetic number, because the mean of its divisors is an integer number (1078480).

Almost surely, 2^67768155 is an apocalyptic number.

67768155 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

67768155 is an abundant number, since it is smaller than the sum of its proper divisors (87532965).

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

67768155 is a wasteful number, since it uses less digits than its factorization.

67768155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 130 (or 114 counting only the distinct ones).

The product of its digits is 352800, while the sum is 45.

The square root of 67768155 is about 8232.1415804151. The cubic root of 67768155 is about 407.7011038942.

The spelling of 67768155 in words is "sixty-seven million, seven hundred sixty-eight thousand, one hundred fifty-five".