1387680128 has 16 divisors (see below), whose sum is σ = 2764519260. Its totient is φ = 693840000.

The previous prime is 1387680053. The next prime is 1387680193. The reversal of 1387680128 is 8210867831.

It is a tau number, because it is divible by the number of its divisors (16).

It is a super-2 number, since 2×1387680128² = 3851312275292192768, which contains 22 as substring.

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, 5420498 + ... + 5420753.

Almost surely, 2^1387680128 is an apocalyptic number.

It is an amenable number.

1387680128 is a deficient number, since it is larger than the sum of its proper divisors (1376839132).

1387680128 is an equidigital number, since it uses as much as digits as its factorization.

1387680128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10841265 (or 10841253 counting only the distinct ones).

The product of its (nonzero) digits is 129024, while the sum is 44.

The square root of 1387680128 is about 37251.5788658682. The cubic root of 1387680128 is about 1115.3978157791.

The spelling of 1387680128 in words is "one billion, three hundred eighty-seven million, six hundred eighty thousand, one hundred twenty-eight".