64632140 has 24 divisors (see below), whose sum is σ = 138030480. Its totient is φ = 25414208.

The previous prime is 64632137. The next prime is 64632149. The reversal of 64632140 is 4123646.

It is a super-3 number, since 3×64632140³ (a number of 24 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (64632149) 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, 26207 + ... + 28566.

It is an arithmetic number, because the mean of its divisors is an integer number (5751270).

Almost surely, 2^64632140 is an apocalyptic number.

It is an amenable number.

64632140 is an abundant number, since it is smaller than the sum of its proper divisors (73398340).

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

64632140 is a wasteful number, since it uses less digits than its factorization.

64632140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54841 (or 54839 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 26.

The square root of 64632140 is about 8039.4116700167. The cubic root of 64632140 is about 401.3126460224.

Adding to 64632140 its reverse (4123646), we get a palindrome (68755786).

The spelling of 64632140 in words is "sixty-four million, six hundred thirty-two thousand, one hundred forty".