172479780 has 120 divisors (see below), whose sum is σ = 590325120. Its totient is φ = 41808960.

The previous prime is 172479761. The next prime is 172479781. The reversal of 172479780 is 87974271.

It is a happy number.

172479780 is a `hidden beast` number, since 172 + 479 + 7 + 8 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (172479781) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 12981 + ... + 22659.

It is an arithmetic number, because the mean of its divisors is an integer number (4919376).

Almost surely, 2^172479780 is an apocalyptic number.

172479780 is a gapful number since it is divisible by the number (10) 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 172479780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (295162560).

172479780 is an abundant number, since it is smaller than the sum of its proper divisors (417845340).

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

172479780 is a wasteful number, since it uses less digits than its factorization.

172479780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9711 (or 9700 counting only the distinct ones).

The product of its (nonzero) digits is 197568, while the sum is 45.

The square root of 172479780 is about 13133.1557517605. The cubic root of 172479780 is about 556.6463895148.

The spelling of 172479780 in words is "one hundred seventy-two million, four hundred seventy-nine thousand, seven hundred eighty".