67420845 has 24 divisors (see below), whose sum is σ = 120024216. Its totient is φ = 34985088.

The previous prime is 67420831. The next prime is 67420849. The reversal of 67420845 is 54802476.

It can be written as a sum of positive squares in 4 ways, for example, as 6487209 + 60933636 = 2547^2 + 7806^2 .

It is not a de Polignac number, because 67420845 - 2¹⁴ = 67404461 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (67420849) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 18582 + ... + 21911.

It is an arithmetic number, because the mean of its divisors is an integer number (5001009).

Almost surely, 2^67420845 is an apocalyptic number.

It is an amenable number.

67420845 is a deficient number, since it is larger than the sum of its proper divisors (52603371).

67420845 is a wasteful number, since it uses less digits than its factorization.

67420845 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40541 (or 40538 counting only the distinct ones).

The product of its (nonzero) digits is 53760, while the sum is 36.

The square root of 67420845 is about 8211.0197296073. The cubic root of 67420845 is about 407.0034248837.

It can be divided in two parts, 67420 and 845, that added together give a triangular number (68265 = T₃₆₉).

The spelling of 67420845 in words is "sixty-seven million, four hundred twenty thousand, eight hundred forty-five".