55780650 has 72 divisors (see below), whose sum is σ = 155448384. Its totient is φ = 14871600.

The previous prime is 55780643. The next prime is 55780651. The reversal of 55780650 is 5608755.

It is a super-2 number, since 2×55780650² = 6222961828845000, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (55780651) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 9855 + ... + 14445.

Almost surely, 2^55780650 is an apocalyptic number.

55780650 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 55780650, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (77724192).

55780650 is an abundant number, since it is smaller than the sum of its proper divisors (99667734).

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

55780650 is a wasteful number, since it uses less digits than its factorization.

55780650 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4618 (or 4601 counting only the distinct ones).

The product of its (nonzero) digits is 42000, while the sum is 36.

The square root of 55780650 is about 7468.6444553212. The cubic root of 55780650 is about 382.0860573820.

The spelling of 55780650 in words is "fifty-five million, seven hundred eighty thousand, six hundred fifty".