1988355428 has 48 divisors (see below), whose sum is σ = 3858503040. Its totient is φ = 891753984.

The previous prime is 1988355419. The next prime is 1988355431. The reversal of 1988355428 is 8245538891.

It is a self number, because there is not a number n which added to its sum of digits gives 1988355428.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 456083 + ... + 460421.

It is an arithmetic number, because the mean of its divisors is an integer number (80385480).

Almost surely, 2^1988355428 is an apocalyptic number.

It is an amenable number.

1988355428 is a deficient number, since it is larger than the sum of its proper divisors (1870147612).

1988355428 is a wasteful number, since it uses less digits than its factorization.

1988355428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4676 (or 4674 counting only the distinct ones).

The product of its digits is 2764800, while the sum is 53.

The square root of 1988355428 is about 44590.9792222597. The cubic root of 1988355428 is about 1257.4710820238.

The spelling of 1988355428 in words is "one billion, nine hundred eighty-eight million, three hundred fifty-five thousand, four hundred twenty-eight".