1245778000 has 40 divisors (see below), whose sum is σ = 3012296040. Its totient is φ = 498310400.

The previous prime is 1245777977. The next prime is 1245778007. The reversal of 1245778000 is 8775421.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 138485824 + 1107292176 = 11768^2 + 33276^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is a super-4 number, since 4×1245778000⁴ (a number of 37 digits) contains 4444 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1245778007) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 309445 + ... + 313444.

It is an arithmetic number, because the mean of its divisors is an integer number (75307401).

Almost surely, 2^1245778000 is an apocalyptic number.

1245778000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1245778000 is an abundant number, since it is smaller than the sum of its proper divisors (1766518040).

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

1245778000 is an equidigital number, since it uses as much as digits as its factorization.

1245778000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 622912 (or 622896 counting only the distinct ones).

The product of its (nonzero) digits is 15680, while the sum is 34.

The square root of 1245778000 is about 35295.5804598819. The cubic root of 1245778000 is about 1076.0031738919.

The spelling of 1245778000 in words is "one billion, two hundred forty-five million, seven hundred seventy-eight thousand".