55782930 has 64 divisors (see below), whose sum is σ = 154471680. Its totient is φ = 12628224.

The previous prime is 55782893. The next prime is 55782931. The reversal of 55782930 is 3928755.

It is a super-2 number, since 2×55782930² = 6223470558769800, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (55782931) 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, 21672 + ... + 24108.

It is an arithmetic number, because the mean of its divisors is an integer number (2413620).

Almost surely, 2^55782930 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 55782930, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (77235840).

55782930 is an abundant number, since it is smaller than the sum of its proper divisors (98688750).

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

55782930 is a wasteful number, since it uses less digits than its factorization.

55782930 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2563.

The product of its (nonzero) digits is 75600, while the sum is 39.

The square root of 55782930 is about 7468.7970919017. The cubic root of 55782930 is about 382.0912631558.

The spelling of 55782930 in words is "fifty-five million, seven hundred eighty-two thousand, nine hundred thirty".