164720440 has 32 divisors (see below), whose sum is σ = 371090160. Its totient is φ = 65804800.

The previous prime is 164720431. The next prime is 164720441. The reversal of 164720440 is 44027461.

It is a junction number, because it is equal to n+sod(n) for n = 164720399 and 164720408.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (164720441) 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, 36720 + ... + 40960.

Almost surely, 2^164720440 is an apocalyptic number.

164720440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

164720440 is an abundant number, since it is smaller than the sum of its proper divisors (206369720).

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

164720440 is a wasteful number, since it uses less digits than its factorization.

164720440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5223 (or 5219 counting only the distinct ones).

The product of its (nonzero) digits is 5376, while the sum is 28.

The square root of 164720440 is about 12834.3461072234. The cubic root of 164720440 is about 548.1707159882.

The spelling of 164720440 in words is "one hundred sixty-four million, seven hundred twenty thousand, four hundred forty".