42720628 has 6 divisors (see below), whose sum is σ = 74761106. Its totient is φ = 21360312.

The previous prime is 42720619. The next prime is 42720631. The reversal of 42720628 is 82602724.

It can be written as a sum of positive squares in only one way, i.e., 42146064 + 574564 = 6492^2 + 758^2 .

It is a super-3 number, since 3×42720628³ (a number of 24 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 42720628.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5340075 + ... + 5340082.

Almost surely, 2^42720628 is an apocalyptic number.

It is an amenable number.

42720628 is a deficient number, since it is larger than the sum of its proper divisors (32040478).

42720628 is a wasteful number, since it uses less digits than its factorization.

42720628 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10680161 (or 10680159 counting only the distinct ones).

The product of its (nonzero) digits is 10752, while the sum is 31.

The square root of 42720628 is about 6536.1018963905. The cubic root of 42720628 is about 349.5794349815.

The spelling of 42720628 in words is "forty-two million, seven hundred twenty thousand, six hundred twenty-eight".