1649867136 has 64 divisors (see below), whose sum is σ = 4640269680. Its totient is φ = 517603328.

The previous prime is 1649867069. The next prime is 1649867171. The reversal of 1649867136 is 6317689461.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (64).

It is a Smith number, since the sum of its digits (51) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (51).

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, 119841 + ... + 132896.

Almost surely, 2^1649867136 is an apocalyptic number.

1649867136 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1649867136 is an abundant number, since it is smaller than the sum of its proper divisors (2990402544).

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

1649867136 is a wasteful number, since it uses less digits than its factorization.

1649867136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 252771 (or 252759 counting only the distinct ones).

The product of its digits is 1306368, while the sum is 51.

The square root of 1649867136 is about 40618.5565474698. The cubic root of 1649867136 is about 1181.6340322751.

The spelling of 1649867136 in words is "one billion, six hundred forty-nine million, eight hundred sixty-seven thousand, one hundred thirty-six".