1987777352 has 36 divisors (see below), whose sum is σ = 4099571385. Its totient is φ = 902904640.

The previous prime is 1987777291. The next prime is 1987777409. The reversal of 1987777352 is 2537777891.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

It can be written as a sum of positive squares in 2 ways, for example, as 1741726756 + 246050596 = 41734^2 + 15686^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=31526.

It is a super-2 number, since 2×1987777352² = 7902517602248263808, which contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 1386428 + ... + 1387860.

Almost surely, 2^1987777352 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1987777352

1987777352 is an abundant number, since it is smaller than the sum of its proper divisors (2111794033).

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

1987777352 is an equidigital number, since it uses as much as digits as its factorization.

1987777352 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2894 (or 1446 counting only the distinct ones).

The product of its digits is 5186160, while the sum is 56.

The square root of 1987777352 is about 44584.4967673742. The cubic root of 1987777352 is about 1257.3492083889.

The spelling of 1987777352 in words is "one billion, nine hundred eighty-seven million, seven hundred seventy-seven thousand, three hundred fifty-two".