67617945 has 12 divisors (see below), whose sum is σ = 117204516. Its totient is φ = 36062880.

The previous prime is 67617923. The next prime is 67617947. The reversal of 67617945 is 54971676.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 44836416 + 22781529 = 6696^2 + 4773^2 .

It is not a de Polignac number, because 67617945 - 2⁷ = 67617817 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45), and also a Moran number because the ratio is a prime number: 1502621 = 67617945 / (6 + 7 + 6 + 1 + 7 + 9 + 4 + 5).

It is a self number, because there is not a number n which added to its sum of digits gives 67617945.

It is not an unprimeable number, because it can be changed into a prime (67617947) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 751266 + ... + 751355.

It is an arithmetic number, because the mean of its divisors is an integer number (9767043).

Almost surely, 2^67617945 is an apocalyptic number.

It is an amenable number.

67617945 is a deficient number, since it is larger than the sum of its proper divisors (49586571).

67617945 is a wasteful number, since it uses less digits than its factorization.

67617945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1502632 (or 1502629 counting only the distinct ones).

The product of its digits is 317520, while the sum is 45.

The square root of 67617945 is about 8223.0131338823. The cubic root of 67617945 is about 407.3996541158.

It can be divided in two parts, 6761 and 7945, that added together give a triangular number (14706 = T₁₇₁).

The spelling of 67617945 in words is "sixty-seven million, six hundred seventeen thousand, nine hundred forty-five".