1987625478 has 32 divisors (see below), whose sum is σ = 4015287936. Its totient is φ = 655883648.

The previous prime is 1987625449. The next prime is 1987625501. The reversal of 1987625478 is 8745267891.

It is a congruent number.

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, 885025 + ... + 887267.

It is an arithmetic number, because the mean of its divisors is an integer number (125477748).

Almost surely, 2^1987625478 is an apocalyptic number.

1987625478 is an abundant number, since it is smaller than the sum of its proper divisors (2027662458).

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

1987625478 is a wasteful number, since it uses less digits than its factorization.

1987625478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3668.

The product of its digits is 6773760, while the sum is 57.

The square root of 1987625478 is about 44582.7935194734. The cubic root of 1987625478 is about 1257.3171854334.

It can be divided in two parts, 19876 and 25478, that added together give a palindrome (45354).

The spelling of 1987625478 in words is "one billion, nine hundred eighty-seven million, six hundred twenty-five thousand, four hundred seventy-eight".