1650464640 has 512 divisors, whose sum is σ = 6727104000. Its totient is φ = 378224640.

The previous prime is 1650464633. The next prime is 1650464671. The reversal of 1650464640 is 464640561.

1650464640 is a `hidden beast` number, since 1 + 6 + 5 + 0 + 4 + 6 + 4 + 640 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 1650464595 and 1650464604.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 3611292 + ... + 3611748.

It is an arithmetic number, because the mean of its divisors is an integer number (13138875).

Almost surely, 2^1650464640 is an apocalyptic number.

1650464640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1650464640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3363552000).

1650464640 is an abundant number, since it is smaller than the sum of its proper divisors (5076639360).

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

1650464640 is a wasteful number, since it uses less digits than its factorization.

1650464640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 515 (or 497 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 36.

The square root of 1650464640 is about 40625.9109436330. The cubic root of 1650464640 is about 1181.7766590826.

The spelling of 1650464640 in words is "one billion, six hundred fifty million, four hundred sixty-four thousand, six hundred forty".