65673720 has 384 divisors, whose sum is σ = 273326400. Its totient is φ = 13934592.

The previous prime is 65673701. The next prime is 65673721. The reversal of 65673720 is 2737656.

It is a happy number.

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 (65673721) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 899604 + ... + 899676.

Almost surely, 2^65673720 is an apocalyptic number.

65673720 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 65673720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (136663200).

65673720 is an abundant number, since it is smaller than the sum of its proper divisors (207652680).

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

65673720 is a wasteful number, since it uses less digits than its factorization.

65673720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 124 (or 107 counting only the distinct ones).

The product of its (nonzero) digits is 52920, while the sum is 36.

The square root of 65673720 is about 8103.9323787899. The cubic root of 65673720 is about 403.4569542671.

The spelling of 65673720 in words is "sixty-five million, six hundred seventy-three thousand, seven hundred twenty".