1649865672 has 320 divisors, whose sum is σ = 5813808000. Its totient is φ = 434367360.

The previous prime is 1649865671. The next prime is 1649865697. The reversal of 1649865672 is 2765689461.

1649865672 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a super-3 number, since 3×1649865672³ (a number of 29 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is not an unprimeable number, because it can be changed into a prime (1649865671) by changing a digit.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 2889147 + ... + 2889717.

It is an arithmetic number, because the mean of its divisors is an integer number (18168150).

Almost surely, 2^1649865672 is an apocalyptic number.

1649865672 is a gapful number since it is divisible by the number (12) 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 1649865672, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2906904000).

1649865672 is an abundant number, since it is smaller than the sum of its proper divisors (4163942328).

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

1649865672 is a wasteful number, since it uses less digits than its factorization.

1649865672 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 623 (or 596 counting only the distinct ones).

The product of its digits is 4354560, while the sum is 54.

The square root of 1649865672 is about 40618.5385261459. The cubic root of 1649865672 is about 1181.6336827696.

The spelling of 1649865672 in words is "one billion, six hundred forty-nine million, eight hundred sixty-five thousand, six hundred seventy-two".