634749780 has 96 divisors (see below), whose sum is σ = 2054142720. Its totient is φ = 143447040.

The previous prime is 634749779. The next prime is 634749781. The reversal of 634749780 is 87947436.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (634749779) and next prime (634749781).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (634749781) 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, 28890 + ... + 45870.

It is an arithmetic number, because the mean of its divisors is an integer number (21397320).

Almost surely, 2^634749780 is an apocalyptic number.

634749780 is a gapful number since it is divisible by the number (60) 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 634749780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1027071360).

634749780 is an abundant number, since it is smaller than the sum of its proper divisors (1419392940).

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

634749780 is a wasteful number, since it uses less digits than its factorization.

634749780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17089 (or 17087 counting only the distinct ones).

The product of its (nonzero) digits is 1016064, while the sum is 48.

The square root of 634749780 is about 25194.2410086115. The cubic root of 634749780 is about 859.4108909396.

The spelling of 634749780 in words is "six hundred thirty-four million, seven hundred forty-nine thousand, seven hundred eighty".