65903440 has 40 divisors (see below), whose sum is σ = 154677600. Its totient is φ = 26111616.

The previous prime is 65903437. The next prime is 65903443. The reversal of 65903440 is 4430956.

It is an interprime number because it is at equal distance from previous prime (65903437) and next prime (65903443).

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65903443) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4711 + ... + 12409.

It is an arithmetic number, because the mean of its divisors is an integer number (3866940).

Almost surely, 2^65903440 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 65903440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (77338800).

65903440 is an abundant number, since it is smaller than the sum of its proper divisors (88774160).

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

65903440 is a wasteful number, since it uses less digits than its factorization.

65903440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7819 (or 7813 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 31.

The square root of 65903440 is about 8118.0933722149. The cubic root of 65903440 is about 403.9268239847.

The spelling of 65903440 in words is "sixty-five million, nine hundred three thousand, four hundred forty".