66719744 has 104 divisors (see below), whose sum is σ = 165130560. Its totient is φ = 26247168.

The previous prime is 66719717. The next prime is 66719753. The reversal of 66719744 is 44791766.

It is a tau number, because it is divible by the number of its divisors (104).

It is a junction number, because it is equal to n+sod(n) for n = 66719695 and 66719704.

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, 372647 + ... + 372825.

Almost surely, 2^66719744 is an apocalyptic number.

66719744 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66719744, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (82565280).

66719744 is an abundant number, since it is smaller than the sum of its proper divisors (98410816).

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

66719744 is a wasteful number, since it uses less digits than its factorization.

66719744 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 223 (or 201 counting only the distinct ones).

The product of its digits is 254016, while the sum is 44.

The square root of 66719744 is about 8168.2154721824. The cubic root of 66719744 is about 405.5877135138.

The spelling of 66719744 in words is "sixty-six million, seven hundred nineteen thousand, seven hundred forty-four".