66763408 has 20 divisors (see below), whose sum is σ = 129483900. Its totient is φ = 33348224.

The previous prime is 66763393. The next prime is 66763409. The reversal of 66763408 is 80436766.

It can be written as a sum of positive squares in 2 ways, for example, as 29942784 + 36820624 = 5472^2 + 6068^2 .

It is not an unprimeable number, because it can be changed into a prime (66763409) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24918 + ... + 27466.

It is an arithmetic number, because the mean of its divisors is an integer number (6474195).

Almost surely, 2^66763408 is an apocalyptic number.

It is an amenable number.

66763408 is a deficient number, since it is larger than the sum of its proper divisors (62720492).

66763408 is a wasteful number, since it uses less digits than its factorization.

66763408 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4194 (or 4188 counting only the distinct ones).

The product of its (nonzero) digits is 145152, while the sum is 40.

The square root of 66763408 is about 8170.8878342564. The cubic root of 66763408 is about 405.6761716871.

The spelling of 66763408 in words is "sixty-six million, seven hundred sixty-three thousand, four hundred eight".