64021428 has 30 divisors (see below), whose sum is σ = 167365506. Its totient is φ = 21340368.

The previous prime is 64021423. The next prime is 64021457. The reversal of 64021428 is 82412046.

64021428 is a `hidden beast` number, since 640 + 2 + 14 + 2 + 8 = 666.

It can be written as a sum of positive squares in only one way, i.e., 53406864 + 10614564 = 7308^2 + 3258^2 .

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64021421) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 98475 + ... + 99122.

Almost surely, 2^64021428 is an apocalyptic number.

It is an amenable number.

64021428 is an abundant number, since it is smaller than the sum of its proper divisors (103344078).

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

64021428 is a wasteful number, since it uses less digits than its factorization.

64021428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 197613 (or 197602 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 27.

The square root of 64021428 is about 8001.3391379194. The cubic root of 64021428 is about 400.0446366854.

The spelling of 64021428 in words is "sixty-four million, twenty-one thousand, four hundred twenty-eight".