65737980 has 480 divisors, whose sum is σ = 281014272. Its totient is φ = 12441600.

The previous prime is 65737961. The next prime is 65737993. The reversal of 65737980 is 8973756.

It is a happy number.

65737980 is a `hidden beast` number, since 6 + 573 + 79 + 8 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 159 ways as a sum of consecutive naturals, for example, 2120565 + ... + 2120595.

Almost surely, 2^65737980 is an apocalyptic number.

65737980 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 65737980, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (140507136).

65737980 is an abundant number, since it is smaller than the sum of its proper divisors (215276292).

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

65737980 is a wasteful number, since it uses less digits than its factorization.

65737980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87 (or 76 counting only the distinct ones).

The product of its (nonzero) digits is 317520, while the sum is 45.

The square root of 65737980 is about 8107.8961512836. The cubic root of 65737980 is about 403.5885020280.

The spelling of 65737980 in words is "sixty-five million, seven hundred thirty-seven thousand, nine hundred eighty".