164643988 has 6 divisors (see below), whose sum is σ = 288126986. Its totient is φ = 82321992.

The previous prime is 164643967. The next prime is 164644009. The reversal of 164643988 is 889346461.

It is an interprime number because it is at equal distance from previous prime (164643967) and next prime (164644009).

It can be written as a sum of positive squares in only one way, i.e., 136469124 + 28174864 = 11682^2 + 5308^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20580495 + ... + 20580502.

Almost surely, 2^164643988 is an apocalyptic number.

It is an amenable number.

164643988 is a deficient number, since it is larger than the sum of its proper divisors (123482998).

164643988 is a wasteful number, since it uses less digits than its factorization.

164643988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41161001 (or 41160999 counting only the distinct ones).

The product of its digits is 995328, while the sum is 49.

The square root of 164643988 is about 12831.3673472471. The cubic root of 164643988 is about 548.0858950375.

The spelling of 164643988 in words is "one hundred sixty-four million, six hundred forty-three thousand, nine hundred eighty-eight".