1649953764 has 18 divisors (see below), whose sum is σ = 4170716550. Its totient is φ = 549984576.

The previous prime is 1649953741. The next prime is 1649953831. The reversal of 1649953764 is 4673599461.

1649953764 is a `hidden beast` number, since 1 + 6 + 49 + 9 + 537 + 64 = 666.

It can be written as a sum of positive squares in only one way, i.e., 1537424100 + 112529664 = 39210^2 + 10608^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a self number, because there is not a number n which added to its sum of digits gives 1649953764.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 22915989 + ... + 22916060.

It is an arithmetic number, because the mean of its divisors is an integer number (231706475).

Almost surely, 2^1649953764 is an apocalyptic number.

It is an amenable number.

1649953764 is an abundant number, since it is smaller than the sum of its proper divisors (2520762786).

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

1649953764 is a wasteful number, since it uses less digits than its factorization.

1649953764 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45832059 (or 45832054 counting only the distinct ones).

The product of its digits is 4898880, while the sum is 54.

The square root of 1649953764 is about 40619.6228933751. The cubic root of 1649953764 is about 1181.6547128901.

The spelling of 1649953764 in words is "one billion, six hundred forty-nine million, nine hundred fifty-three thousand, seven hundred sixty-four".