64521030 has 32 divisors (see below), whose sum is σ = 176972544. Its totient is φ = 14747616.

The previous prime is 64521029. The next prime is 64521031. The reversal of 64521030 is 3012546.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (64521029) and next prime (64521031).

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 64520988 and 64521006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64521031) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 153412 + ... + 153831.

It is an arithmetic number, because the mean of its divisors is an integer number (5530392).

Almost surely, 2^64521030 is an apocalyptic number.

64521030 is an abundant number, since it is smaller than the sum of its proper divisors (112451514).

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

64521030 is a wasteful number, since it uses less digits than its factorization.

64521030 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 307260.

The product of its (nonzero) digits is 720, while the sum is 21.

The square root of 64521030 is about 8032.4983660129. The cubic root of 64521030 is about 401.0825467550.

Adding to 64521030 its reverse (3012546), we get a palindrome (67533576).

The spelling of 64521030 in words is "sixty-four million, five hundred twenty-one thousand, thirty".