61800385 has 16 divisors (see below), whose sum is σ = 76340880. Its totient is φ = 48006400.

The previous prime is 61800383. The next prime is 61800419. The reversal of 61800385 is 58300816.

It can be written as a sum of positive squares in 8 ways, for example, as 15233409 + 46566976 = 3903^2 + 6824^2 .

It is not a de Polignac number, because 61800385 - 2¹ = 61800383 is a prime.

It is a super-2 number, since 2×61800385² = 7638575172296450, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (61800383) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 25611 + ... + 27919.

It is an arithmetic number, because the mean of its divisors is an integer number (4771305).

Almost surely, 2^61800385 is an apocalyptic number.

It is an amenable number.

61800385 is a deficient number, since it is larger than the sum of its proper divisors (14540495).

61800385 is a wasteful number, since it uses less digits than its factorization.

61800385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2468.

The product of its (nonzero) digits is 5760, while the sum is 31.

The square root of 61800385 is about 7861.3220898269. The cubic root of 61800385 is about 395.3639437964.

The spelling of 61800385 in words is "sixty-one million, eight hundred thousand, three hundred eighty-five".