1649896478 has 32 divisors (see below), whose sum is σ = 2720511360. Its totient is φ = 746959360.

The previous prime is 1649896471. The next prime is 1649896481. The reversal of 1649896478 is 8746989461.

It is a self number, because there is not a number n which added to its sum of digits gives 1649896478.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1649896471) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 286043 + ... + 291753.

It is an arithmetic number, because the mean of its divisors is an integer number (85015980).

Almost surely, 2^1649896478 is an apocalyptic number.

1649896478 is a deficient number, since it is larger than the sum of its proper divisors (1070614882).

1649896478 is a wasteful number, since it uses less digits than its factorization.

1649896478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6052.

The product of its digits is 20901888, while the sum is 62.

The square root of 1649896478 is about 40618.9177354592. The cubic root of 1649896478 is about 1181.6410371422.

The spelling of 1649896478 in words is "one billion, six hundred forty-nine million, eight hundred ninety-six thousand, four hundred seventy-eight".