1649464740 has 432 divisors, whose sum is σ = 6506572800. Its totient is φ = 330739200.

The previous prime is 1649464703. The next prime is 1649464777. The reversal of 1649464740 is 474649461.

It is an interprime number because it is at equal distance from previous prime (1649464703) and next prime (1649464777).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 4726086 + ... + 4726434.

Almost surely, 2^1649464740 is an apocalyptic number.

1649464740 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 1649464740, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3253286400).

1649464740 is an abundant number, since it is smaller than the sum of its proper divisors (4857108060).

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

1649464740 is a wasteful number, since it uses less digits than its factorization.

1649464740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 424 (or 408 counting only the distinct ones).

The product of its (nonzero) digits is 580608, while the sum is 45.

The square root of 1649464740 is about 40613.6028936119. The cubic root of 1649464740 is about 1181.5379591915.

The spelling of 1649464740 in words is "one billion, six hundred forty-nine million, four hundred sixty-four thousand, seven hundred forty".