129780634 has 8 divisors (see below), whose sum is σ = 194852340. Its totient is φ = 64829856.

The previous prime is 129780619. The next prime is 129780649. The reversal of 129780634 is 436087921.

It is an interprime number because it is at equal distance from previous prime (129780619) and next prime (129780649).

It can be written as a sum of positive squares in 2 ways, for example, as 129618225 + 162409 = 11385^2 + 403^2 .

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

It is a super-2 number, since 2×129780634² = 33686025922883912, 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, 27499 + ... + 31870.

Almost surely, 2^129780634 is an apocalyptic number.

129780634 is a deficient number, since it is larger than the sum of its proper divisors (65071706).

129780634 is a wasteful number, since it uses less digits than its factorization.

129780634 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60464.

The product of its (nonzero) digits is 72576, while the sum is 40.

The square root of 129780634 is about 11392.1303538890. The cubic root of 129780634 is about 506.2946020958.

The spelling of 129780634 in words is "one hundred twenty-nine million, seven hundred eighty thousand, six hundred thirty-four".