64136740 has 12 divisors (see below), whose sum is σ = 134687196. Its totient is φ = 25654688.

The previous prime is 64136729. The next prime is 64136741. The reversal of 64136740 is 4763146.

It can be written as a sum of positive squares in 2 ways, for example, as 39614436 + 24522304 = 6294^2 + 4952^2 .

It is a super-2 number, since 2×64136740² = 8227042835655200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (64136741) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1603399 + ... + 1603438.

It is an arithmetic number, because the mean of its divisors is an integer number (11223933).

Almost surely, 2^64136740 is an apocalyptic number.

It is an amenable number.

64136740 is an abundant number, since it is smaller than the sum of its proper divisors (70550456).

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

64136740 is a wasteful number, since it uses less digits than its factorization.

64136740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3206846 (or 3206844 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 31.

The square root of 64136740 is about 8008.5416899708. The cubic root of 64136740 is about 400.2846723561.

Adding to 64136740 its reverse (4763146), we get a palindrome (68899886).

The spelling of 64136740 in words is "sixty-four million, one hundred thirty-six thousand, seven hundred forty".