1581342480 has 160 divisors (see below), whose sum is σ = 5476792320. Its totient is φ = 419374080.

The previous prime is 1581342473. The next prime is 1581342487. The reversal of 1581342480 is 842431851.

1581342480 is a `hidden beast` number, since 1 + 581 + 34 + 2 + 48 + 0 = 666.

It is an interprime number because it is at equal distance from previous prime (1581342473) and next prime (1581342487).

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

It is not an unprimeable number, because it can be changed into a prime (1581342487) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 410644 + ... + 414476.

It is an arithmetic number, because the mean of its divisors is an integer number (34229952).

Almost surely, 2^1581342480 is an apocalyptic number.

1581342480 is a gapful number since it is divisible by the number (10) 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 1581342480, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2738396160).

1581342480 is an abundant number, since it is smaller than the sum of its proper divisors (3895449840).

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

1581342480 is a wasteful number, since it uses less digits than its factorization.

1581342480 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4046 (or 4034 counting only the distinct ones).

The product of its (nonzero) digits is 30720, while the sum is 36.

The square root of 1581342480 is about 39766.0971180225. The cubic root of 1581342480 is about 1165.0430654505.

The spelling of 1581342480 in words is "one billion, five hundred eighty-one million, three hundred forty-two thousand, four hundred eighty".