129477620 has 12 divisors (see below), whose sum is σ = 271903044. Its totient is φ = 51791040.

The previous prime is 129477619. The next prime is 129477653. The reversal of 129477620 is 26774921.

It can be written as a sum of positive squares in 2 ways, for example, as 42354064 + 87123556 = 6508^2 + 9334^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3236921 + ... + 3236960.

It is an arithmetic number, because the mean of its divisors is an integer number (22658587).

Almost surely, 2^129477620 is an apocalyptic number.

129477620 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

129477620 is an abundant number, since it is smaller than the sum of its proper divisors (142425424).

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

129477620 is a wasteful number, since it uses less digits than its factorization.

129477620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6473890 (or 6473888 counting only the distinct ones).

The product of its (nonzero) digits is 42336, while the sum is 38.

The square root of 129477620 is about 11378.8233135065. The cubic root of 129477620 is about 505.9002599892.

The spelling of 129477620 in words is "one hundred twenty-nine million, four hundred seventy-seven thousand, six hundred twenty".