64634020 has 24 divisors (see below), whose sum is σ = 148071168. Its totient is φ = 23503200.

The previous prime is 64633993. The next prime is 64634021. The reversal of 64634020 is 2043646.

It is not an unprimeable number, because it can be changed into a prime (64634021) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 146676 + ... + 147115.

It is an arithmetic number, because the mean of its divisors is an integer number (6169632).

Almost surely, 2^64634020 is an apocalyptic number.

It is an amenable number.

64634020 is an abundant number, since it is smaller than the sum of its proper divisors (83437148).

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

64634020 is a wasteful number, since it uses less digits than its factorization.

64634020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 293811 (or 293809 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 25.

The square root of 64634020 is about 8039.5285931452. The cubic root of 64634020 is about 401.3165370714.

Adding to 64634020 its reverse (2043646), we get a palindrome (66677666).

The spelling of 64634020 in words is "sixty-four million, six hundred thirty-four thousand, twenty".