64153640 has 32 divisors (see below), whose sum is σ = 145159560. Its totient is φ = 25516800.

The previous prime is 64153627. The next prime is 64153651. The reversal of 64153640 is 4635146.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 51294244 + 12859396 = 7162^2 + 3586^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2810 + ... + 11670.

Almost surely, 2^64153640 is an apocalyptic number.

It is an amenable number.

64153640 is an abundant number, since it is smaller than the sum of its proper divisors (81005920).

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

64153640 is a wasteful number, since it uses less digits than its factorization.

64153640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9053 (or 9049 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 29.

The square root of 64153640 is about 8009.5967439066. The cubic root of 64153640 is about 400.3198275410.

Adding to 64153640 its reverse (4635146), we get a palindrome (68788786).

The spelling of 64153640 in words is "sixty-four million, one hundred fifty-three thousand, six hundred forty".