2545905420 has 144 divisors (see below), whose sum is σ = 8083857600. Its totient is φ = 647336448.

The previous prime is 2545905409. The next prime is 2545905493. The reversal of 2545905420 is 245095452.

2545905420 is a `hidden beast` number, since 2 + 545 + 90 + 5 + 4 + 20 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1642806 + ... + 1644354.

It is an arithmetic number, because the mean of its divisors is an integer number (56137900).

Almost surely, 2^2545905420 is an apocalyptic number.

2545905420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2545905420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4041928800).

2545905420 is an abundant number, since it is smaller than the sum of its proper divisors (5537952180).

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

2545905420 is a wasteful number, since it uses less digits than its factorization.

2545905420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1984 (or 1979 counting only the distinct ones).

The product of its (nonzero) digits is 72000, while the sum is 36.

The square root of 2545905420 is about 50456.9660205605. The cubic root of 2545905420 is about 1365.4655739860.

The spelling of 2545905420 in words is "two billion, five hundred forty-five million, nine hundred five thousand, four hundred twenty".