64620540 has 36 divisors (see below), whose sum is σ = 196016184. Its totient is φ = 17232096.

The previous prime is 64620511. The next prime is 64620557. The reversal of 64620540 is 4502646.

It is a happy number.

64620540 is a `hidden beast` number, since 64 + 62 + 0 + 540 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 179322 + ... + 179681.

It is an arithmetic number, because the mean of its divisors is an integer number (5444894).

Almost surely, 2^64620540 is an apocalyptic number.

64620540 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

64620540 is an abundant number, since it is smaller than the sum of its proper divisors (131395644).

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

64620540 is a wasteful number, since it uses less digits than its factorization.

64620540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 359018 (or 359013 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 27.

The square root of 64620540 is about 8038.6901918161. The cubic root of 64620540 is about 401.2886357533.

The spelling of 64620540 in words is "sixty-four million, six hundred twenty thousand, five hundred forty".