1387551680 has 28 divisors (see below), whose sum is σ = 3304108200. Its totient is φ = 555020544.

The previous prime is 1387551677. The next prime is 1387551701. The reversal of 1387551680 is 861557831.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2167730 + ... + 2168369.

Almost surely, 2^1387551680 is an apocalyptic number.

1387551680 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1387551680 is an abundant number, since it is smaller than the sum of its proper divisors (1916556520).

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

1387551680 is an equidigital number, since it uses as much as digits as its factorization.

1387551680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4336116 (or 4336106 counting only the distinct ones).

The product of its (nonzero) digits is 201600, while the sum is 44.

The square root of 1387551680 is about 37249.8547648175. The cubic root of 1387551680 is about 1115.3633998172.

The spelling of 1387551680 in words is "one billion, three hundred eighty-seven million, five hundred fifty-one thousand, six hundred eighty".