61899816 has 64 divisors (see below), whose sum is σ = 173407680. Its totient is φ = 18247680.

The previous prime is 61899809. The next prime is 61899841.

61899816 is nontrivially palindromic in base 10.

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, 6600 + ... + 12936.

It is an arithmetic number, because the mean of its divisors is an integer number (2709495).

Almost surely, 2^61899816 is an apocalyptic number.

61899816 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 61899816, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (86703840).

61899816 is an abundant number, since it is smaller than the sum of its proper divisors (111507864).

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

61899816 is a wasteful number, since it uses less digits than its factorization.

61899816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6394 (or 6390 counting only the distinct ones).

The product of its digits is 186624, while the sum is 48.

The square root of 61899816 is about 7867.6436116540. The cubic root of 61899816 is about 395.5758646355.

The spelling of 61899816 in words is "sixty-one million, eight hundred ninety-nine thousand, eight hundred sixteen".