129977472 has 64 divisors (see below), whose sum is σ = 351165600. Its totient is φ = 42584064.

The previous prime is 129977467. The next prime is 129977479. The reversal of 129977472 is 274779921.

It is a tau number, because it is divible by the number of its divisors (64).

It is a Harshad number since it is a multiple of its sum of digits (48).

It is not an unprimeable number, because it can be changed into a prime (129977479) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19788 + ... + 25524.

Almost surely, 2^129977472 is an apocalyptic number.

129977472 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 129977472, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (175582800).

129977472 is an abundant number, since it is smaller than the sum of its proper divisors (221188128).

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

129977472 is an equidigital number, since it uses as much as digits as its factorization.

129977472 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5813 (or 5801 counting only the distinct ones).

The product of its digits is 444528, while the sum is 48.

The square root of 129977472 is about 11400.7662900351. The cubic root of 129977472 is about 506.5504380978.

The spelling of 129977472 in words is "one hundred twenty-nine million, nine hundred seventy-seven thousand, four hundred seventy-two".