915540487680 has 640 divisors, whose sum is σ = 3758987409408. Its totient is φ = 184767086592.

The previous prime is 915540487649. The next prime is 915540487709. The reversal of 915540487680 is 86784045519.

It is a tau number, because it is divible by the number of its divisors (640).

It is a self number, because there is not a number n which added to its sum of digits gives 915540487680.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 16045762 + ... + 16102718.

Almost surely, 2^915540487680 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 915540487680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1879493704704).

915540487680 is an abundant number, since it is smaller than the sum of its proper divisors (2843446921728).

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

915540487680 is a wasteful number, since it uses less digits than its factorization.

915540487680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57026 (or 57010 counting only the distinct ones).

The product of its (nonzero) digits is 9676800, while the sum is 57.

The spelling of 915540487680 in words is "nine hundred fifteen billion, five hundred forty million, four hundred eighty-seven thousand, six hundred eighty".