7515423540 has 96 divisors (see below), whose sum is σ = 23777712000. Its totient is φ = 1970136576.

The previous prime is 7515423499. The next prime is 7515423557. The reversal of 7515423540 is 453245157.

7515423540 is a `hidden beast` number, since 75 + 1 + 5 + 42 + 3 + 540 = 666.

It is a super-2 number, since 2×7515423540² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 7515423495 and 7515423504.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 86085 + ... + 149804.

It is an arithmetic number, because the mean of its divisors is an integer number (247684500).

Almost surely, 2^7515423540 is an apocalyptic number.

It is an amenable number.

7515423540 is an abundant number, since it is smaller than the sum of its proper divisors (16262288460).

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

7515423540 is a wasteful number, since it uses less digits than its factorization.

7515423540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 235966 (or 235958 counting only the distinct ones).

The product of its (nonzero) digits is 84000, while the sum is 36.

The square root of 7515423540 is about 86691.5424940634. The cubic root of 7515423540 is about 1958.7747044553.

Adding to 7515423540 its reverse (453245157), we get a palindrome (7968668697).

The spelling of 7515423540 in words is "seven billion, five hundred fifteen million, four hundred twenty-three thousand, five hundred forty".