129670780 has 24 divisors (see below), whose sum is σ = 284149152. Its totient is φ = 49612992.

The previous prime is 129670729. The next prime is 129670819. The reversal of 129670780 is 87076921.

It is a super-2 number, since 2×129670780² = 33629022371616800, which contains 22 as substring.

It is a congruent number.

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, 140487 + ... + 141406.

It is an arithmetic number, because the mean of its divisors is an integer number (11839548).

Almost surely, 2^129670780 is an apocalyptic number.

129670780 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

129670780 is an abundant number, since it is smaller than the sum of its proper divisors (154478372).

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

129670780 is a wasteful number, since it uses less digits than its factorization.

129670780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 281925 (or 281923 counting only the distinct ones).

The product of its (nonzero) digits is 42336, while the sum is 40.

The square root of 129670780 is about 11387.3078468969. The cubic root of 129670780 is about 506.1517092111.

The spelling of 129670780 in words is "one hundred twenty-nine million, six hundred seventy thousand, seven hundred eighty".