55780505 has 16 divisors (see below), whose sum is σ = 73471104. Its totient is φ = 40318080.

The previous prime is 55780489. The next prime is 55780513. The reversal of 55780505 is 50508755.

It is not a de Polignac number, because 55780505 - 2⁴ = 55780489 is a prime.

It is a super-2 number, since 2×55780505² = 6222929476110050, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6149 + ... + 12221.

It is an arithmetic number, because the mean of its divisors is an integer number (4591944).

Almost surely, 2^55780505 is an apocalyptic number.

55780505 is a gapful number since it is divisible by the number (55) formed by its first and last digit.

It is an amenable number.

55780505 is a deficient number, since it is larger than the sum of its proper divisors (17690599).

55780505 is a wasteful number, since it uses less digits than its factorization.

55780505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6256.

The product of its (nonzero) digits is 35000, while the sum is 35.

The square root of 55780505 is about 7468.6347480647. The cubic root of 55780505 is about 382.0857263083.

The spelling of 55780505 in words is "fifty-five million, seven hundred eighty thousand, five hundred five".