1591278672 has 80 divisors (see below), whose sum is σ = 4194176000. Its totient is φ = 519772032.

The previous prime is 1591278643. The next prime is 1591278677. The reversal of 1591278672 is 2768721951.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1591278677) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 525579 + ... + 528597.

It is an arithmetic number, because the mean of its divisors is an integer number (52427200).

Almost surely, 2^1591278672 is an apocalyptic number.

1591278672 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1591278672, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2097088000).

1591278672 is an abundant number, since it is smaller than the sum of its proper divisors (2602897328).

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

1591278672 is a wasteful number, since it uses less digits than its factorization.

1591278672 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3248 (or 3242 counting only the distinct ones).

The product of its digits is 423360, while the sum is 48.

The square root of 1591278672 is about 39890.8344359954. The cubic root of 1591278672 is about 1167.4781125313.

The spelling of 1591278672 in words is "one billion, five hundred ninety-one million, two hundred seventy-eight thousand, six hundred seventy-two".