67391628 has 12 divisors (see below), whose sum is σ = 157247160. Its totient is φ = 22463872.

The previous prime is 67391609. The next prime is 67391647. The reversal of 67391628 is 82619376.

It is a happy number.

67391628 is digitally balanced in base 9, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (67391609) and next prime (67391647).

It is a tau number, because it is divible by the number of its divisors (12).

67391628 is strictly pandigital in base 9.

It is a self number, because there is not a number n which added to its sum of digits gives 67391628.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2807973 + ... + 2807996.

It is an arithmetic number, because the mean of its divisors is an integer number (13103930).

Almost surely, 2^67391628 is an apocalyptic number.

It is an amenable number.

67391628 is an abundant number, since it is smaller than the sum of its proper divisors (89855532).

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

67391628 is a wasteful number, since it uses less digits than its factorization.

67391628 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5615976 (or 5615974 counting only the distinct ones).

The product of its digits is 108864, while the sum is 42.

The square root of 67391628 is about 8209.2404033504. The cubic root of 67391628 is about 406.9446243886.

The spelling of 67391628 in words is "sixty-seven million, three hundred ninety-one thousand, six hundred twenty-eight".