64477980 has 144 divisors (see below), whose sum is σ = 226908864. Its totient is φ = 14515200.

The previous prime is 64477967. The next prime is 64477981. The reversal of 64477980 is 8977446.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64477981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 91630 + ... + 92330.

It is an arithmetic number, because the mean of its divisors is an integer number (1575756).

Almost surely, 2^64477980 is an apocalyptic number.

64477980 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 64477980, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (113454432).

64477980 is an abundant number, since it is smaller than the sum of its proper divisors (162430884).

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

64477980 is a wasteful number, since it uses less digits than its factorization.

64477980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 796 (or 791 counting only the distinct ones).

The product of its (nonzero) digits is 338688, while the sum is 45.

The square root of 64477980 is about 8029.8181797597. The cubic root of 64477980 is about 400.9933228988.

The spelling of 64477980 in words is "sixty-four million, four hundred seventy-seven thousand, nine hundred eighty".