1378428072 has 32 divisors (see below), whose sum is σ = 3938366400. Its totient is φ = 393836544.

The previous prime is 1378428071. The next prime is 1378428083. The reversal of 1378428072 is 2708248731.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is not an unprimeable number, because it can be changed into a prime (1378428071) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4102297 + ... + 4102632.

It is an arithmetic number, because the mean of its divisors is an integer number (123073950).

Almost surely, 2^1378428072 is an apocalyptic number.

1378428072 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1378428072 is an abundant number, since it is smaller than the sum of its proper divisors (2559938328).

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

1378428072 is a wasteful number, since it uses less digits than its factorization.

1378428072 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8204945 (or 8204941 counting only the distinct ones).

The product of its (nonzero) digits is 150528, while the sum is 42.

The square root of 1378428072 is about 37127.1877739211. The cubic root of 1378428072 is about 1112.9133951950.

The spelling of 1378428072 in words is "one billion, three hundred seventy-eight million, four hundred twenty-eight thousand, seventy-two".