1651264000 has 80 divisors (see below), whose sum is σ = 4117689576. Its totient is φ = 660480000.

The previous prime is 1651263997. The next prime is 1651264061. The reversal of 1651264000 is 4621561.

It can be written as a sum of positive squares in 4 ways, for example, as 499611904 + 1151652096 = 22352^2 + 33936^2 .

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (25).

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, 51100 + ... + 76900.

Almost surely, 2^1651264000 is an apocalyptic number.

1651264000 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 1651264000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2058844788).

1651264000 is an abundant number, since it is smaller than the sum of its proper divisors (2466425576).

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

1651264000 is an frugal number, since it uses more digits than its factorization.

1651264000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25834 (or 25808 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 25.

The square root of 1651264000 is about 40635.7478090412. The cubic root of 1651264000 is about 1181.9674159762.

Adding to 1651264000 its reverse (4621561), we get a palindrome (1655885561).

The spelling of 1651264000 in words is "one billion, six hundred fifty-one million, two hundred sixty-four thousand".