1649438763 has 64 divisors (see below), whose sum is σ = 2642534400. Its totient is φ = 895732992.

The previous prime is 1649438761. The next prime is 1649438779. The reversal of 1649438763 is 3678349461.

It is not a de Polignac number, because 1649438763 - 2¹ = 1649438761 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1649438761) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 8288538 + ... + 8288736.

It is an arithmetic number, because the mean of its divisors is an integer number (41289600).

Almost surely, 2^1649438763 is an apocalyptic number.

1649438763 is a deficient number, since it is larger than the sum of its proper divisors (993095637).

1649438763 is a wasteful number, since it uses less digits than its factorization.

1649438763 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 456.

The product of its digits is 2612736, while the sum is 51.

The square root of 1649438763 is about 40613.2830857098. The cubic root of 1649438763 is about 1181.5317565789.

The spelling of 1649438763 in words is "one billion, six hundred forty-nine million, four hundred thirty-eight thousand, seven hundred sixty-three".