164045640 has 64 divisors (see below), whose sum is σ = 536880960. Its totient is φ = 39768320.

The previous prime is 164045621. The next prime is 164045641. The reversal of 164045640 is 46540461.

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

It is a junction number, because it is equal to n+sod(n) for n = 164045598 and 164045607.

It is not an unprimeable number, because it can be changed into a prime (164045641) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 60819 + ... + 63458.

It is an arithmetic number, because the mean of its divisors is an integer number (8388765).

Almost surely, 2^164045640 is an apocalyptic number.

164045640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

164045640 is an abundant number, since it is smaller than the sum of its proper divisors (372835320).

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

164045640 is a wasteful number, since it uses less digits than its factorization.

164045640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 124302 (or 124298 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 30.

The square root of 164045640 is about 12808.0302935307. The cubic root of 164045640 is about 547.4211391597.

The spelling of 164045640 in words is "one hundred sixty-four million, forty-five thousand, six hundred forty".