647464560 has 40 divisors (see below), whose sum is σ = 2007140880. Its totient is φ = 172657152.

The previous prime is 647464547. The next prime is 647464561. The reversal of 647464560 is 65464746.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (647464561) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1348645 + ... + 1349124.

It is an arithmetic number, because the mean of its divisors is an integer number (50178522).

Almost surely, 2^647464560 is an apocalyptic number.

647464560 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

647464560 is an abundant number, since it is smaller than the sum of its proper divisors (1359676320).

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

647464560 is a wasteful number, since it uses less digits than its factorization.

647464560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2697785 (or 2697779 counting only the distinct ones).

The product of its (nonzero) digits is 483840, while the sum is 42.

The square root of 647464560 is about 25445.3249144121. The cubic root of 647464560 is about 865.1113314107. Note that the first 3 decimals are identical.

The spelling of 647464560 in words is "six hundred forty-seven million, four hundred sixty-four thousand, five hundred sixty".