66763690 has 32 divisors (see below), whose sum is σ = 139092480. Its totient is φ = 22598784.

The previous prime is 66763679. The next prime is 66763759. The reversal of 66763690 is 9636766.

It is a super-2 number, since 2×66763690² = 8914780604832200, which contains 22 as substring.

It is a Smith number, since the sum of its digits (43) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 507 + ... + 11566.

It is an arithmetic number, because the mean of its divisors is an integer number (4346640).

Almost surely, 2^66763690 is an apocalyptic number.

66763690 is an abundant number, since it is smaller than the sum of its proper divisors (72328790).

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

66763690 is a wasteful number, since it uses less digits than its factorization.

66763690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12166.

The product of its (nonzero) digits is 244944, while the sum is 43.

The square root of 66763690 is about 8170.9050906249. The cubic root of 66763690 is about 405.6767428609.

The spelling of 66763690 in words is "sixty-six million, seven hundred sixty-three thousand, six hundred ninety".