33866864640 has 960 divisors, whose sum is σ = 146507961600. Its totient is φ = 7309688832.

The previous prime is 33866864617. The next prime is 33866864663. The reversal of 33866864640 is 4646866833.

It is an interprime number because it is at equal distance from previous prime (33866864617) and next prime (33866864663).

It is a tau number, because it is divible by the number of its divisors (960).

It is a super-2 number, since 2×33866864640² (a number of 22 digits) contains 22 as substring.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 110315367 + ... + 110315673.

It is an arithmetic number, because the mean of its divisors is an integer number (152612460).

Almost surely, 2^33866864640 is an apocalyptic number.

33866864640 is a gapful number since it is divisible by the number (30) 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 33866864640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (73253980800).

33866864640 is an abundant number, since it is smaller than the sum of its proper divisors (112641096960).

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

33866864640 is a wasteful number, since it uses less digits than its factorization.

33866864640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 372 (or 343 counting only the distinct ones).

The product of its (nonzero) digits is 11943936, while the sum is 54.

The spelling of 33866864640 in words is "thirty-three billion, eight hundred sixty-six million, eight hundred sixty-four thousand, six hundred forty".