169649640 has 80 divisors (see below), whose sum is σ = 570222180. Its totient is φ = 45239040.

The previous prime is 169649629. The next prime is 169649659. The reversal of 169649640 is 46946961.

It can be written as a sum of positive squares in 2 ways, for example, as 151142436 + 18507204 = 12294^2 + 4302^2 .

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 22941 + ... + 29420.

Almost surely, 2^169649640 is an apocalyptic number.

169649640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

169649640 is an abundant number, since it is smaller than the sum of its proper divisors (400572540).

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

169649640 is a wasteful number, since it uses less digits than its factorization.

169649640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52384 (or 52371 counting only the distinct ones).

The product of its (nonzero) digits is 279936, while the sum is 45.

The square root of 169649640 is about 13024.9621880449. The cubic root of 169649640 is about 553.5850002758.

The spelling of 169649640 in words is "one hundred sixty-nine million, six hundred forty-nine thousand, six hundred forty".