64771530 has 64 divisors (see below), whose sum is σ = 166561920. Its totient is φ = 16062464.

The previous prime is 64771507. The next prime is 64771537. The reversal of 64771530 is 3517746.

It is a junction number, because it is equal to n+sod(n) for n = 64771491 and 64771500.

It is not an unprimeable number, because it can be changed into a prime (64771537) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 44677 + ... + 46103.

It is an arithmetic number, because the mean of its divisors is an integer number (2602530).

Almost surely, 2^64771530 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 64771530, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (83280960).

64771530 is an abundant number, since it is smaller than the sum of its proper divisors (101790390).

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

64771530 is a wasteful number, since it uses less digits than its factorization.

64771530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1543.

The product of its (nonzero) digits is 17640, while the sum is 33.

The square root of 64771530 is about 8048.0761676316. The cubic root of 64771530 is about 401.6009381112.

The spelling of 64771530 in words is "sixty-four million, seven hundred seventy-one thousand, five hundred thirty".