65613450 has 144 divisors (see below), whose sum is σ = 193380480. Its totient is φ = 14676480.

The previous prime is 65613439. The next prime is 65613451. The reversal of 65613450 is 5431656.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is not an unprimeable number, because it can be changed into a prime (65613451) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 580594 + ... + 580706.

It is an arithmetic number, because the mean of its divisors is an integer number (1342920).

Almost surely, 2^65613450 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 65613450, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (96690240).

65613450 is an abundant number, since it is smaller than the sum of its proper divisors (127767030).

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

65613450 is a wasteful number, since it uses less digits than its factorization.

65613450 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 221 (or 209 counting only the distinct ones).

The product of its (nonzero) digits is 10800, while the sum is 30.

The square root of 65613450 is about 8100.2129601635. The cubic root of 65613450 is about 403.3334964976. Note that the first 3 decimals are identical.

It can be divided in two parts, 6561 and 3450, that added together give a triangular number (10011 = T₁₄₁).

The spelling of 65613450 in words is "sixty-five million, six hundred thirteen thousand, four hundred fifty".