1428378012 has 36 divisors (see below), whose sum is σ = 3823013376. Its totient is φ = 448118400.

The previous prime is 1428378011. The next prime is 1428378031. The reversal of 1428378012 is 2108738241.

It is a tau number, because it is divible by the number of its divisors (36).

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1428378011) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1166364 + ... + 1167587.

It is an arithmetic number, because the mean of its divisors is an integer number (106194816).

Almost surely, 2^1428378012 is an apocalyptic number.

1428378012 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1428378012 is an abundant number, since it is smaller than the sum of its proper divisors (2394635364).

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

1428378012 is a wasteful number, since it uses less digits than its factorization.

1428378012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2333978 (or 2333973 counting only the distinct ones).

The product of its (nonzero) digits is 21504, while the sum is 36.

The square root of 1428378012 is about 37793.8885535744. Note that the first 3 decimals coincide. The cubic root of 1428378012 is about 1126.1970499820.

The spelling of 1428378012 in words is "one billion, four hundred twenty-eight million, three hundred seventy-eight thousand, twelve".