65440980 has 192 divisors, whose sum is σ = 232243200. Its totient is φ = 15143040.

The previous prime is 65440979. The next prime is 65440987. The reversal of 65440980 is 8904456.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65440987) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 136381 + ... + 136859.

It is an arithmetic number, because the mean of its divisors is an integer number (1209600).

Almost surely, 2^65440980 is an apocalyptic number.

65440980 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 65440980, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (116121600).

65440980 is an abundant number, since it is smaller than the sum of its proper divisors (166802220).

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

65440980 is a wasteful number, since it uses less digits than its factorization.

65440980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 531 (or 523 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 36.

The square root of 65440980 is about 8089.5599385875. The cubic root of 65440980 is about 402.9797886943.

The spelling of 65440980 in words is "sixty-five million, four hundred forty thousand, nine hundred eighty".