1425664820 has 24 divisors (see below), whose sum is σ = 2995526184. Its totient is φ = 569955456.

The previous prime is 1425664819. The next prime is 1425664843. The reversal of 1425664820 is 284665241.

It can be written as a sum of positive squares in 4 ways, for example, as 493461796 + 932203024 = 22214^2 + 30532^2 .

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, 20222 + ... + 57098.

It is an arithmetic number, because the mean of its divisors is an integer number (124813591).

Almost surely, 2^1425664820 is an apocalyptic number.

1425664820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1425664820 is an abundant number, since it is smaller than the sum of its proper divisors (1569861364).

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

1425664820 is a wasteful number, since it uses less digits than its factorization.

1425664820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38819 (or 38817 counting only the distinct ones).

The product of its (nonzero) digits is 92160, while the sum is 38.

The square root of 1425664820 is about 37757.9769055494. The cubic root of 1425664820 is about 1125.4835307471.

The spelling of 1425664820 in words is "one billion, four hundred twenty-five million, six hundred sixty-four thousand, eight hundred twenty".