15538784648 has 32 divisors (see below), whose sum is σ = 29744366400. Its totient is φ = 7607540928.

The previous prime is 15538784641. The next prime is 15538784663. The reversal of 15538784648 is 84648783551.

It is not an unprimeable number, because it can be changed into a prime (15538784641) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 176843 + ... + 249701.

It is an arithmetic number, because the mean of its divisors is an integer number (929511450).

Almost surely, 2^15538784648 is an apocalyptic number.

It is an amenable number.

15538784648 is a deficient number, since it is larger than the sum of its proper divisors (14205581752).

15538784648 is a wasteful number, since it uses less digits than its factorization.

15538784648 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73421 (or 73417 counting only the distinct ones).

The product of its digits is 25804800, while the sum is 59.

The spelling of 15538784648 in words is "fifteen billion, five hundred thirty-eight million, seven hundred eighty-four thousand, six hundred forty-eight".