66938744 has 8 divisors (see below), whose sum is σ = 125510160. Its totient is φ = 33469368.

The previous prime is 66938743. The next prime is 66938747. The reversal of 66938744 is 44783966.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66938743) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4183664 + ... + 4183679.

It is an arithmetic number, because the mean of its divisors is an integer number (15688770).

Almost surely, 2^66938744 is an apocalyptic number.

It is an amenable number.

66938744 is a deficient number, since it is larger than the sum of its proper divisors (58571416).

66938744 is a wasteful number, since it uses less digits than its factorization.

66938744 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8367349 (or 8367345 counting only the distinct ones).

The product of its digits is 870912, while the sum is 47.

The square root of 66938744 is about 8181.6101104856. The cubic root of 66938744 is about 406.0309940990.

The spelling of 66938744 in words is "sixty-six million, nine hundred thirty-eight thousand, seven hundred forty-four".