2520428987 has 4 divisors (see below), whose sum is σ = 2630012880. Its totient is φ = 2410845096.

The previous prime is 2520428951. The next prime is 2520429001. The reversal of 2520428987 is 7898240252.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 2520428987 - 2¹⁰ = 2520427963 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2520428917) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 54791912 + ... + 54791957.

It is an arithmetic number, because the mean of its divisors is an integer number (657503220).

Almost surely, 2^2520428987 is an apocalyptic number.

2520428987 is a deficient number, since it is larger than the sum of its proper divisors (109583893).

2520428987 is a wasteful number, since it uses less digits than its factorization.

2520428987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 109583892.

The product of its (nonzero) digits is 645120, while the sum is 47.

The square root of 2520428987 is about 50203.8742230119. The cubic root of 2520428987 is about 1360.8956375148.

The spelling of 2520428987 in words is "two billion, five hundred twenty million, four hundred twenty-eight thousand, nine hundred eighty-seven".