1283778450 has 48 divisors (see below), whose sum is σ = 3537526560. Its totient is φ = 342340560.

The previous prime is 1283778449. The next prime is 1283778451. The reversal of 1283778450 is 548773821.

1283778450 is a `hidden beast` number, since 128 + 3 + 7 + 78 + 450 = 666.

It is an interprime number because it is at equal distance from previous prime (1283778449) and next prime (1283778451).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a junction number, because it is equal to n+sod(n) for n = 1283778396 and 1283778405.

It is not an unprimeable number, because it can be changed into a prime (1283778451) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 474124 + ... + 476823.

It is an arithmetic number, because the mean of its divisors is an integer number (73698470).

Almost surely, 2^1283778450 is an apocalyptic number.

1283778450 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1283778450 is an abundant number, since it is smaller than the sum of its proper divisors (2253748110).

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

1283778450 is a wasteful number, since it uses less digits than its factorization.

1283778450 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 950968 (or 950957 counting only the distinct ones).

The product of its (nonzero) digits is 376320, while the sum is 45.

The square root of 1283778450 is about 35829.8541721844. The cubic root of 1283778450 is about 1086.8343607905.

The spelling of 1283778450 in words is "one billion, two hundred eighty-three million, seven hundred seventy-eight thousand, four hundred fifty".