65149440 has 160 divisors (see below), whose sum is σ = 220968000. Its totient is φ = 16318464.

The previous prime is 65149433. The next prime is 65149453. The reversal of 65149440 is 4494156.

It is a tau number, because it is divible by the number of its divisors (160).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 130311 + ... + 130809.

It is an arithmetic number, because the mean of its divisors is an integer number (1381050).

Almost surely, 2^65149440 is an apocalyptic number.

65149440 is a gapful number since it is divisible by the number (60) 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 65149440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (110484000).

65149440 is an abundant number, since it is smaller than the sum of its proper divisors (155818560).

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

65149440 is a wasteful number, since it uses less digits than its factorization.

65149440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 542 (or 526 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 33.

The square root of 65149440 is about 8071.5203028921. The cubic root of 65149440 is about 402.3804719472.

The spelling of 65149440 in words is "sixty-five million, one hundred forty-nine thousand, four hundred forty".