1564645290 has 32 divisors (see below), whose sum is σ = 4044007296. Its totient is φ = 385143360.

The previous prime is 1564645289. The next prime is 1564645297. The reversal of 1564645290 is 925464651.

It is a super-2 number, since 2×1564645290² = 4896229767038368200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1564645297) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2005566 + ... + 2006345.

It is an arithmetic number, because the mean of its divisors is an integer number (126375228).

Almost surely, 2^1564645290 is an apocalyptic number.

1564645290 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1564645290 is an abundant number, since it is smaller than the sum of its proper divisors (2479362006).

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

1564645290 is a wasteful number, since it uses less digits than its factorization.

1564645290 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4011934.

The product of its (nonzero) digits is 259200, while the sum is 42.

The square root of 1564645290 is about 39555.5974547219. The cubic root of 1564645290 is about 1160.9280350906.

The spelling of 1564645290 in words is "one billion, five hundred sixty-four million, six hundred forty-five thousand, two hundred ninety".