172649540 has 72 divisors (see below), whose sum is σ = 435439872. Its totient is φ = 57274560.

The previous prime is 172649539. The next prime is 172649579. The reversal of 172649540 is 45946271.

It is a junction number, because it is equal to n+sod(n) for n = 172649494 and 172649503.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 27539 + ... + 33221.

It is an arithmetic number, because the mean of its divisors is an integer number (6047776).

Almost surely, 2^172649540 is an apocalyptic number.

172649540 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 172649540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (217719936).

172649540 is an abundant number, since it is smaller than the sum of its proper divisors (262790332).

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

172649540 is a wasteful number, since it uses less digits than its factorization.

172649540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5737 (or 5728 counting only the distinct ones).

The product of its (nonzero) digits is 60480, while the sum is 38.

The square root of 172649540 is about 13139.6171938150. The cubic root of 172649540 is about 556.8289525684.

The spelling of 172649540 in words is "one hundred seventy-two million, six hundred forty-nine thousand, five hundred forty".