64435420 has 48 divisors (see below), whose sum is σ = 161376768. Its totient is φ = 21130560.

The previous prime is 64435409. The next prime is 64435433. The reversal of 64435420 is 2453446.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6786 + ... + 13225.

It is an arithmetic number, because the mean of its divisors is an integer number (3362016).

Almost surely, 2^64435420 is an apocalyptic number.

It is an amenable number.

64435420 is an abundant number, since it is smaller than the sum of its proper divisors (96941348).

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

64435420 is a wasteful number, since it uses less digits than its factorization.

64435420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20050 (or 20048 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 28.

The square root of 64435420 is about 8027.1676200264. The cubic root of 64435420 is about 400.9050755510.

Adding to 64435420 its reverse (2453446), we get a palindrome (66888866).

The spelling of 64435420 in words is "sixty-four million, four hundred thirty-five thousand, four hundred twenty".