129663770 has 8 divisors (see below), whose sum is σ = 233394804. Its totient is φ = 51865504.

The previous prime is 129663767. The next prime is 129663803. The reversal of 129663770 is 77366921.

It is a Cunningham number, because it is equal to 11387²+1.

It can be written as a sum of positive squares in 2 ways, for example, as 129663769 + 1 = 11387^2 + 1^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×129663770² = 33625386501225800, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6483179 + ... + 6483198.

Almost surely, 2^129663770 is an apocalyptic number.

129663770 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

129663770 is a deficient number, since it is larger than the sum of its proper divisors (103731034).

129663770 is a wasteful number, since it uses less digits than its factorization.

129663770 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12966384.

The product of its (nonzero) digits is 95256, while the sum is 41.

The square root of 129663770 is about 11387.0000439097. Note that the first 4 decimals coincide. The cubic root of 129663770 is about 506.1425881960.

The spelling of 129663770 in words is "one hundred twenty-nine million, six hundred sixty-three thousand, seven hundred seventy".