64199880 has 48 divisors (see below), whose sum is σ = 208650780. Its totient is φ = 17119872.

The previous prime is 64199867. The next prime is 64199887. The reversal of 64199880 is 8899146.

It can be written as a sum of positive squares in 2 ways, for example, as 62441604 + 1758276 = 7902^2 + 1326^2 .

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 (64199887) 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, 88807 + ... + 89526.

Almost surely, 2^64199880 is an apocalyptic number.

64199880 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

64199880 is an abundant number, since it is smaller than the sum of its proper divisors (144450900).

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

64199880 is a wasteful number, since it uses less digits than its factorization.

64199880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 178350 (or 178343 counting only the distinct ones).

The product of its (nonzero) digits is 124416, while the sum is 45.

The square root of 64199880 is about 8012.4827612919. The cubic root of 64199880 is about 400.4159839102.

The spelling of 64199880 in words is "sixty-four million, one hundred ninety-nine thousand, eight hundred eighty".