1988656740 has 72 divisors (see below), whose sum is σ = 6894014400. Its totient is φ = 454549824.

The previous prime is 1988656721. The next prime is 1988656757. The reversal of 1988656740 is 476568891.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 787890 + ... + 790409.

It is an arithmetic number, because the mean of its divisors is an integer number (95750200).

Almost surely, 2^1988656740 is an apocalyptic number.

1988656740 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1988656740 is an abundant number, since it is smaller than the sum of its proper divisors (4905357660).

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

1988656740 is a wasteful number, since it uses less digits than its factorization.

1988656740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1578321 (or 1578316 counting only the distinct ones).

The product of its (nonzero) digits is 2903040, while the sum is 54.

The square root of 1988656740 is about 44594.3577148500. The cubic root of 1988656740 is about 1257.5345971586.

The spelling of 1988656740 in words is "one billion, nine hundred eighty-eight million, six hundred fifty-six thousand, seven hundred forty".