1245996780 has 48 divisors (see below), whose sum is σ = 3987191040. Its totient is φ = 284799168.

The previous prime is 1245996761. The next prime is 1245996781. The reversal of 1245996780 is 876995421.

It is not an unprimeable number, because it can be changed into a prime (1245996781) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1482910 + ... + 1483749.

It is an arithmetic number, because the mean of its divisors is an integer number (83066480).

Almost surely, 2^1245996780 is an apocalyptic number.

1245996780 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1245996780 is an abundant number, since it is smaller than the sum of its proper divisors (2741194260).

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

1245996780 is a wasteful number, since it uses less digits than its factorization.

1245996780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2966678 (or 2966676 counting only the distinct ones).

The product of its (nonzero) digits is 1088640, while the sum is 51.

The square root of 1245996780 is about 35298.6795787038. The cubic root of 1245996780 is about 1076.0661584138.

The spelling of 1245996780 in words is "one billion, two hundred forty-five million, nine hundred ninety-six thousand, seven hundred eighty".