1961877888 has 64 divisors (see below), whose sum is σ = 5790274800. Its totient is φ = 653958144.

The previous prime is 1961877817. The next prime is 1961877959. The reversal of 1961877888 is 8887781691.

1961877888 is a `hidden beast` number, since 1 + 9 + 618 + 7 + 7 + 8 + 8 + 8 = 666.

It is an interprime number because it is at equal distance from previous prime (1961877817) and next prime (1961877959).

It is a tau number, because it is divible by the number of its divisors (64).

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, 280381 + ... + 287292.

Almost surely, 2^1961877888 is an apocalyptic number.

1961877888 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

1961877888 is an abundant number, since it is smaller than the sum of its proper divisors (3828396912).

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

1961877888 is an equidigital number, since it uses as much as digits as its factorization.

1961877888 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 567696 (or 567678 counting only the distinct ones).

The product of its digits is 10838016, while the sum is 63.

The square root of 1961877888 is about 44293.0907478808. The cubic root of 1961877888 is about 1251.8645003015.

The spelling of 1961877888 in words is "one billion, nine hundred sixty-one million, eight hundred seventy-seven thousand, eight hundred eighty-eight".