65721954 has 16 divisors (see below), whose sum is σ = 132134400. Its totient is φ = 21792240.

The previous prime is 65721947. The next prime is 65721967. The reversal of 65721954 is 45912756.

It is a super-3 number, since 3×65721954³ (a number of 24 digits) contains 333 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27529 + ... + 29820.

It is an arithmetic number, because the mean of its divisors is an integer number (8258400).

Almost surely, 2^65721954 is an apocalyptic number.

65721954 is an abundant number, since it is smaller than the sum of its proper divisors (66412446).

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

65721954 is a wasteful number, since it uses less digits than its factorization.

65721954 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57545.

The product of its digits is 75600, while the sum is 39.

The square root of 65721954 is about 8106.9077952077. The cubic root of 65721954 is about 403.5557029521. Note that the first 3 decimals are identical.

The spelling of 65721954 in words is "sixty-five million, seven hundred twenty-one thousand, nine hundred fifty-four".