64634880 has 120 divisors (see below), whose sum is σ = 207611712. Its totient is φ = 17170432.

The previous prime is 64634873. The next prime is 64634909. The reversal of 64634880 is 8843646.

It is a tau number, because it is divible by the number of its divisors (120).

It is a super-2 number, since 2×64634880² = 8355335425228800, which contains 22 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, 245629 + ... + 245891.

Almost surely, 2^64634880 is an apocalyptic number.

64634880 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 64634880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (103805856).

64634880 is an abundant number, since it is smaller than the sum of its proper divisors (142976832).

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

64634880 is an equidigital number, since it uses as much as digits as its factorization.

64634880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 299 (or 273 counting only the distinct ones).

The product of its (nonzero) digits is 110592, while the sum is 39.

The square root of 64634880 is about 8039.5820786904. The cubic root of 64634880 is about 401.3183169941.

The spelling of 64634880 in words is "sixty-four million, six hundred thirty-four thousand, eight hundred eighty".