1266728400 has 540 divisors, whose sum is σ = 5263850592. Its totient is φ = 281111040.

The previous prime is 1266728387. The next prime is 1266728413. The reversal of 1266728400 is 48276621.

It is an interprime number because it is at equal distance from previous prime (1266728387) and next prime (1266728413).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 107 ways as a sum of consecutive naturals, for example, 7585117 + ... + 7585283.

Almost surely, 2^1266728400 is an apocalyptic number.

1266728400 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 1266728400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2631925296).

1266728400 is an abundant number, since it is smaller than the sum of its proper divisors (3997122192).

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

1266728400 is a wasteful number, since it uses less digits than its factorization.

1266728400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 248 (or 227 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 36.

The square root of 1266728400 is about 35591.1281079990. The cubic root of 1266728400 is about 1082.0014327298.

The spelling of 1266728400 in words is "one billion, two hundred sixty-six million, seven hundred twenty-eight thousand, four hundred".