1988795690 has 32 divisors (see below), whose sum is σ = 4095391104. Its totient is φ = 681180480.

The previous prime is 1988795689. The next prime is 1988795707. The reversal of 1988795690 is 965978891.

It is a super-2 number, since 2×1988795690² = 7910616593125152200, which contains 22 as substring.

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, 57557 + ... + 85383.

It is an arithmetic number, because the mean of its divisors is an integer number (127980972).

Almost surely, 2^1988795690 is an apocalyptic number.

1988795690 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1988795690 is an abundant number, since it is smaller than the sum of its proper divisors (2106595414).

1988795690 is a wasteful number, since it uses less digits than its factorization.

1988795690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28862.

The product of its (nonzero) digits is 9797760, while the sum is 62.

The square root of 1988795690 is about 44595.9156201552. The cubic root of 1988795690 is about 1257.5638849955.

The spelling of 1988795690 in words is "one billion, nine hundred eighty-eight million, seven hundred ninety-five thousand, six hundred ninety".