1378272640 has 32 divisors (see below), whose sum is σ = 3294934560. Its totient is φ = 551308800.

The previous prime is 1378272629. The next prime is 1378272653. The reversal of 1378272640 is 462728731.

It is a tau number, because it is divible by the number of its divisors (32).

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a junction number, because it is equal to n+sod(n) for n = 1378272593 and 1378272602.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 1076136 + ... + 1077415.

It is an arithmetic number, because the mean of its divisors is an integer number (102966705).

Almost surely, 2^1378272640 is an apocalyptic number.

1378272640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1378272640 is an abundant number, since it is smaller than the sum of its proper divisors (1916661920).

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

1378272640 is an equidigital number, since it uses as much as digits as its factorization.

1378272640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2153570 (or 2153558 counting only the distinct ones).

The product of its (nonzero) digits is 112896, while the sum is 40.

The square root of 1378272640 is about 37125.0944779943. The cubic root of 1378272640 is about 1112.8715627965.

The spelling of 1378272640 in words is "one billion, three hundred seventy-eight million, two hundred seventy-two thousand, six hundred forty".