64532640 has 48 divisors (see below), whose sum is σ = 203279328. Its totient is φ = 17208576.

The previous prime is 64532609. The next prime is 64532653. The reversal of 64532640 is 4623546.

It is a tau number, because it is divible by the number of its divisors (48).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 64532598 and 64532607.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 66742 + ... + 67701.

It is an arithmetic number, because the mean of its divisors is an integer number (4234986).

Almost surely, 2^64532640 is an apocalyptic number.

64532640 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

64532640 is an abundant number, since it is smaller than the sum of its proper divisors (138746688).

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

64532640 is a wasteful number, since it uses less digits than its factorization.

64532640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 134461 (or 134453 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 30.

The square root of 64532640 is about 8033.2210227281. The cubic root of 64532640 is about 401.1066024212.

The spelling of 64532640 in words is "sixty-four million, five hundred thirty-two thousand, six hundred forty".