172781130 has 32 divisors (see below), whose sum is σ = 428976000. Its totient is φ = 44485952.

The previous prime is 172781123. The next prime is 172781131. The reversal of 172781130 is 31187271.

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

It is not an unprimeable number, because it can be changed into a prime (172781131) 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 15 ways as a sum of consecutive naturals, for example, 98430 + ... + 100169.

It is an arithmetic number, because the mean of its divisors is an integer number (13405500).

Almost surely, 2^172781130 is an apocalyptic number.

172781130 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

172781130 is an abundant number, since it is smaller than the sum of its proper divisors (256194870).

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

172781130 is a wasteful number, since it uses less digits than its factorization.

172781130 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 198638.

The product of its (nonzero) digits is 2352, while the sum is 30.

The square root of 172781130 is about 13144.6236157602. The cubic root of 172781130 is about 556.9703845776.

The spelling of 172781130 in words is "one hundred seventy-two million, seven hundred eighty-one thousand, one hundred thirty".