1780950640 has 80 divisors (see below), whose sum is σ = 4746785472. Its totient is φ = 608735232.

The previous prime is 1780950631. The next prime is 1780950643. The reversal of 1780950640 is 460590871.

It is a tau number, because it is divible by the number of its divisors (80).

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 = 1780950593 and 1780950602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1780950643) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 184002 + ... + 193438.

Almost surely, 2^1780950640 is an apocalyptic number.

1780950640 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 1780950640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2373392736).

1780950640 is an abundant number, since it is smaller than the sum of its proper divisors (2965834832).

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

1780950640 is a wasteful number, since it uses less digits than its factorization.

1780950640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9794 (or 9788 counting only the distinct ones).

The product of its (nonzero) digits is 60480, while the sum is 40.

The square root of 1780950640 is about 42201.3108801137. The cubic root of 1780950640 is about 1212.1339843962.

1780950640 divided by its sum of digits (40) gives a triangular number (44523766 = T₉₄₃₆).

The spelling of 1780950640 in words is "one billion, seven hundred eighty million, nine hundred fifty thousand, six hundred forty".