66749424 has 40 divisors (see below), whose sum is σ = 197070720. Its totient is φ = 19071168.

The previous prime is 66749393. The next prime is 66749461. The reversal of 66749424 is 42494766.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a zygodrome in base 4.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 98994 + ... + 99665.

It is an arithmetic number, because the mean of its divisors is an integer number (4926768).

Almost surely, 2^66749424 is an apocalyptic number.

It is an amenable number.

66749424 is an abundant number, since it is smaller than the sum of its proper divisors (130321296).

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

66749424 is a wasteful number, since it uses less digits than its factorization.

66749424 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 198677 (or 198671 counting only the distinct ones).

The product of its digits is 290304, while the sum is 42.

The square root of 66749424 is about 8170.0320684805. The cubic root of 66749424 is about 405.6478459326.

The spelling of 66749424 in words is "sixty-six million, seven hundred forty-nine thousand, four hundred twenty-four".