1564696980 has 384 divisors, whose sum is σ = 6138961920. Its totient is φ = 324086400.

The previous prime is 1564696979. The next prime is 1564696997. The reversal of 1564696980 is 896964651.

It is a happy number.

It is a super-2 number, since 2×1564696980² = 4896553278442240800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 5031025 + ... + 5031335.

It is an arithmetic number, because the mean of its divisors is an integer number (15986880).

Almost surely, 2^1564696980 is an apocalyptic number.

1564696980 is a gapful number since it is divisible by the number (10) 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 1564696980, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3069480960).

1564696980 is an abundant number, since it is smaller than the sum of its proper divisors (4574264940).

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

1564696980 is a wasteful number, since it uses less digits than its factorization.

1564696980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 369 (or 339 counting only the distinct ones).

The product of its (nonzero) digits is 2799360, while the sum is 54.

The square root of 1564696980 is about 39556.2508334650. The cubic root of 1564696980 is about 1160.9408191829.

The spelling of 1564696980 in words is "one billion, five hundred sixty-four million, six hundred ninety-six thousand, nine hundred eighty".