129620550 has 24 divisors (see below), whose sum is σ = 321459336. Its totient is φ = 34565440.

The previous prime is 129620531. The next prime is 129620567. The reversal of 129620550 is 55026921.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 431919 + ... + 432218.

It is an arithmetic number, because the mean of its divisors is an integer number (13394139).

Almost surely, 2^129620550 is an apocalyptic number.

129620550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

129620550 is an abundant number, since it is smaller than the sum of its proper divisors (191838786).

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

129620550 is a wasteful number, since it uses less digits than its factorization.

129620550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 864152 (or 864147 counting only the distinct ones).

The product of its (nonzero) digits is 5400, while the sum is 30.

The square root of 129620550 is about 11385.1021075790. The cubic root of 129620550 is about 506.0863455163.

The spelling of 129620550 in words is "one hundred twenty-nine million, six hundred twenty thousand, five hundred fifty".