164020440 has 32 divisors (see below), whose sum is σ = 492061680. Its totient is φ = 43738752.

The previous prime is 164020421. The next prime is 164020457. The reversal of 164020440 is 44020461.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 683299 + ... + 683538.

Almost surely, 2^164020440 is an apocalyptic number.

164020440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

164020440 is an abundant number, since it is smaller than the sum of its proper divisors (328041240).

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

164020440 is a wasteful number, since it uses less digits than its factorization.

164020440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1366851 (or 1366847 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 21.

The square root of 164020440 is about 12807.0464979245. The cubic root of 164020440 is about 547.3931068813.

Adding to 164020440 its sum of digits (21), we get a palindrome (164020461).

The spelling of 164020440 in words is "one hundred sixty-four million, twenty thousand, four hundred forty".