1781493480 has 256 divisors, whose sum is σ = 6435072000. Its totient is φ = 435787776.

The previous prime is 1781493479. The next prime is 1781493517. The reversal of 1781493480 is 843941871.

It is a happy number.

1781493480 is a `hidden beast` number, since 1 + 7 + 81 + 4 + 93 + 480 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 3130636 + ... + 3131204.

It is an arithmetic number, because the mean of its divisors is an integer number (25137000).

Almost surely, 2^1781493480 is an apocalyptic number.

1781493480 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 1781493480, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3217536000).

1781493480 is an abundant number, since it is smaller than the sum of its proper divisors (4653578520).

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

1781493480 is a wasteful number, since it uses less digits than its factorization.

1781493480 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 825 (or 815 counting only the distinct ones).

The product of its (nonzero) digits is 193536, while the sum is 45.

The square root of 1781493480 is about 42207.7419438662. The cubic root of 1781493480 is about 1212.2571261153.

The spelling of 1781493480 in words is "one billion, seven hundred eighty-one million, four hundred ninety-three thousand, four hundred eighty".