64619646 has 64 divisors (see below), whose sum is σ = 167462400. Its totient is φ = 16142976.

The previous prime is 64619629. The next prime is 64619647. The reversal of 64619646 is 64691646.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a junction number, because it is equal to n+sod(n) for n = 64619598 and 64619607.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64619647) 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, 7260 + ... + 13488.

It is an arithmetic number, because the mean of its divisors is an integer number (2616600).

Almost surely, 2^64619646 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 64619646, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (83731200).

64619646 is an abundant number, since it is smaller than the sum of its proper divisors (102842754).

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

64619646 is a wasteful number, since it uses less digits than its factorization.

64619646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6273.

The product of its digits is 186624, while the sum is 42.

The square root of 64619646 is about 8038.6345855500. The cubic root of 64619646 is about 401.2867851875.

The spelling of 64619646 in words is "sixty-four million, six hundred nineteen thousand, six hundred forty-six".