64279980 has 60 divisors (see below), whose sum is σ = 201653760. Its totient is φ = 17140896.

The previous prime is 64279949. The next prime is 64279981. The reversal of 64279980 is 8997246.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (60).

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

It is not an unprimeable number, because it can be changed into a prime (64279981) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 18220 + ... + 21459.

It is an arithmetic number, because the mean of its divisors is an integer number (3360896).

Almost surely, 2^64279980 is an apocalyptic number.

64279980 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

64279980 is an abundant number, since it is smaller than the sum of its proper divisors (137373780).

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

64279980 is a wasteful number, since it uses less digits than its factorization.

64279980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39700 (or 39689 counting only the distinct ones).

The product of its (nonzero) digits is 217728, while the sum is 45.

The square root of 64279980 is about 8017.4796538563. The cubic root of 64279980 is about 400.5824431550.

The spelling of 64279980 in words is "sixty-four million, two hundred seventy-nine thousand, nine hundred eighty".