780989440 has 264 divisors, whose sum is σ = 2385852192. Its totient is φ = 242565120.

The previous prime is 780989437. The next prime is 780989477. The reversal of 780989440 is 44989087.

It is a Harshad number since it is a multiple of its sum of digits (49).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2759539 + ... + 2759821.

Almost surely, 2^780989440 is an apocalyptic number.

780989440 is a gapful number since it is divisible by the number (70) 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 780989440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1192926096).

780989440 is an abundant number, since it is smaller than the sum of its proper divisors (1604862752).

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

780989440 is a wasteful number, since it uses less digits than its factorization.

780989440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 333 (or 308 counting only the distinct ones).

The product of its (nonzero) digits is 580608, while the sum is 49.

The square root of 780989440 is about 27946.1882910711. The cubic root of 780989440 is about 920.9054727420.

The spelling of 780989440 in words is "seven hundred eighty million, nine hundred eighty-nine thousand, four hundred forty".