1550640000 has 640 divisors, whose sum is σ = 6423943680. Its totient is φ = 322560000.

The previous prime is 1550639999. The next prime is 1550640029. The reversal of 1550640000 is 460551.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (640).

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 21839965 + ... + 21840035.

It is an arithmetic number, because the mean of its divisors is an integer number (10037412).

Almost surely, 2^1550640000 is an apocalyptic number.

1550640000 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 1550640000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3211971840).

1550640000 is an abundant number, since it is smaller than the sum of its proper divisors (4873303680).

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

1550640000 is an equidigital number, since it uses as much as digits as its factorization.

1550640000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128 (or 101 counting only the distinct ones).

The product of its (nonzero) digits is 600, while the sum is 21.

The square root of 1550640000 is about 39378.1665393400. The cubic root of 1550640000 is about 1157.4537888929.

The spelling of 1550640000 in words is "one billion, five hundred fifty million, six hundred forty thousand".