1564420725 has 36 divisors (see below), whose sum is σ = 3202347616. Its totient is φ = 715163040.

The previous prime is 1564420687. The next prime is 1564420757. The reversal of 1564420725 is 5270244651.

It is a happy number.

1564420725 is a `hidden beast` number, since 1 + 5 + 644 + 2 + 0 + 7 + 2 + 5 = 666.

It is not a de Polignac number, because 1564420725 - 2¹¹ = 1564418677 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1564420725.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 495067 + ... + 498216.

Almost surely, 2^1564420725 is an apocalyptic number.

1564420725 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1564420725 is an abundant number, since it is smaller than the sum of its proper divisors (1637926891).

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

1564420725 is a wasteful number, since it uses less digits than its factorization.

1564420725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 993306 (or 993298 counting only the distinct ones).

The product of its (nonzero) digits is 67200, while the sum is 36.

The square root of 1564420725 is about 39552.7587533411. The cubic root of 1564420725 is about 1160.8724918781.

The spelling of 1564420725 in words is "one billion, five hundred sixty-four million, four hundred twenty thousand, seven hundred twenty-five".