64428442 has 8 divisors (see below), whose sum is σ = 104076756. Its totient is φ = 29736192.

The previous prime is 64428409. The next prime is 64428499. The reversal of 64428442 is 24482446.

It can be written as a sum of positive squares in 2 ways, for example, as 60699681 + 3728761 = 7791^2 + 1931^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 64428398 and 64428407.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1238983 + ... + 1239034.

Almost surely, 2^64428442 is an apocalyptic number.

64428442 is a deficient number, since it is larger than the sum of its proper divisors (39648314).

64428442 is a wasteful number, since it uses less digits than its factorization.

64428442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2478032.

The product of its digits is 49152, while the sum is 34.

The square root of 64428442 is about 8026.7329593054. The cubic root of 64428442 is about 400.8906030937.

It can be divided in two parts, 6442 and 8442, that added together give a square (14884 = 122²).

The spelling of 64428442 in words is "sixty-four million, four hundred twenty-eight thousand, four hundred forty-two".