42615540 has 72 divisors (see below), whose sum is σ = 141025248. Its totient is φ = 10330560.

The previous prime is 42615509. The next prime is 42615557. The reversal of 42615540 is 4551624.

42615540 is a `hidden beast` number, since 4 + 2 + 615 + 5 + 40 = 666.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 8782 + ... + 12741.

It is an arithmetic number, because the mean of its divisors is an integer number (1958684).

Almost surely, 2^42615540 is an apocalyptic number.

It is an amenable number.

42615540 is an abundant number, since it is smaller than the sum of its proper divisors (98409708).

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

42615540 is a wasteful number, since it uses less digits than its factorization.

42615540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21549 (or 21544 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 27.

The square root of 42615540 is about 6528.0579041550. The cubic root of 42615540 is about 349.2925574294.

It can be divided in two parts, 4261 and 5540, that added together give a square (9801 = 99²).

The spelling of 42615540 in words is "forty-two million, six hundred fifteen thousand, five hundred forty".