1628111990 has 16 divisors (see below), whose sum is σ = 2938340880. Its totient is φ = 649524960.

The previous prime is 1628111987. The next prime is 1628112001. The reversal of 1628111990 is 991118261.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 211001 + ... + 218580.

It is an arithmetic number, because the mean of its divisors is an integer number (183646305).

Almost surely, 2^1628111990 is an apocalyptic number.

1628111990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1628111990 is a deficient number, since it is larger than the sum of its proper divisors (1310228890).

1628111990 is a wasteful number, since it uses less digits than its factorization.

1628111990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 429967.

The product of its (nonzero) digits is 7776, while the sum is 38.

The square root of 1628111990 is about 40349.8697643499. The cubic root of 1628111990 is about 1176.4173606737.

The spelling of 1628111990 in words is "one billion, six hundred twenty-eight million, one hundred eleven thousand, nine hundred ninety".