1649778504 has 32 divisors (see below), whose sum is σ = 4499396640. Its totient is φ = 499932800.

The previous prime is 1649778503. The next prime is 1649778509. The reversal of 1649778504 is 4058779461.

It is a super-2 number, since 2×1649778504² = 5443538224520956032, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1649778503) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3124317 + ... + 3124844.

It is an arithmetic number, because the mean of its divisors is an integer number (140606145).

Almost surely, 2^1649778504 is an apocalyptic number.

It is an amenable number.

1649778504 is an abundant number, since it is smaller than the sum of its proper divisors (2849618136).

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

1649778504 is a wasteful number, since it uses less digits than its factorization.

1649778504 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6249181 (or 6249177 counting only the distinct ones).

The product of its (nonzero) digits is 1693440, while the sum is 51.

The square root of 1649778504 is about 40617.4655043862. The cubic root of 1649778504 is about 1181.6128724979.

The spelling of 1649778504 in words is "one billion, six hundred forty-nine million, seven hundred seventy-eight thousand, five hundred four".