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64999980 = 22325361111
BaseRepresentation
bin1111011111110…
…1001000101100
311112022100012200
43313331020230
5113114444410
610241101500
71416330213
oct367751054
9145270180
1064999980
11337664a1
1219927890
131060aa36
1488c007a
155a8e3c0
hex3dfd22c

64999980 has 36 divisors (see below), whose sum is σ = 197167152. Its totient is φ = 17333280.

The previous prime is 64999943. The next prime is 64999981. The reversal of 64999980 is 8999946.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (36).

It is not an unprimeable number, because it can be changed into a prime (64999981) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 180376 + ... + 180735.

Almost surely, 264999980 is an apocalyptic number.

64999980 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

64999980 is an abundant number, since it is smaller than the sum of its proper divisors (132167172).

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

64999980 is a wasteful number, since it uses less digits than its factorization.

64999980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 361126 (or 361121 counting only the distinct ones).

The product of its (nonzero) digits is 1259712, while the sum is 54.

The square root of 64999980 is about 8062.2565079511. The cubic root of 64999980 is about 402.0725346207.

The spelling of 64999980 in words is "sixty-four million, nine hundred ninety-nine thousand, nine hundred eighty".

Divisors: 1 2 3 4 5 6 9 10 12 15 18 20 30 36 45 60 90 180 361111 722222 1083333 1444444 1805555 2166666 3249999 3611110 4333332 5416665 6499998 7222220 10833330 12999996 16249995 21666660 32499990 64999980