61800819 has 8 divisors (see below), whose sum is σ = 82614480. Its totient is φ = 41093856.

The previous prime is 61800803. The next prime is 61800833. The reversal of 61800819 is 91800816.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 61800819 - 2⁴ = 61800803 is a prime.

It is a super-2 number, since 2×61800819² = 7638682458141522, which contains 22 as substring.

61800819 is a strobogrammatic number because it is the same when read upside-down.

It is a self number, because there is not a number n which added to its sum of digits gives 61800819.

It is not an unprimeable number, because it can be changed into a prime (61800889) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25312 + ... + 27645.

It is an arithmetic number, because the mean of its divisors is an integer number (10326810).

Almost surely, 2^61800819 is an apocalyptic number.

61800819 is a deficient number, since it is larger than the sum of its proper divisors (20813661).

61800819 is a wasteful number, since it uses less digits than its factorization.

61800819 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53349.

The product of its (nonzero) digits is 3456, while the sum is 33.

The square root of 61800819 is about 7861.3496932779. The cubic root of 61800819 is about 395.3648692899.

The spelling of 61800819 in words is "sixty-one million, eight hundred thousand, eight hundred nineteen".