61816398 has 16 divisors (see below), whose sum is σ = 141294720. Its totient is φ = 17661816.

The previous prime is 61816393. The next prime is 61816399. The reversal of 61816398 is 89361816.

It is a Harshad number since it is a multiple of its sum of digits (42), and also a Moran number because the ratio is a prime number: 1471819 = 61816398 / (6 + 1 + 8 + 1 + 6 + 3 + 9 + 8).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61816393) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 735868 + ... + 735951.

It is an arithmetic number, because the mean of its divisors is an integer number (8830920).

Almost surely, 2^61816398 is an apocalyptic number.

61816398 is an abundant number, since it is smaller than the sum of its proper divisors (79478322).

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

61816398 is a wasteful number, since it uses less digits than its factorization.

61816398 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1471831.

The product of its digits is 62208, while the sum is 42.

The square root of 61816398 is about 7862.3404912278. The cubic root of 61816398 is about 395.3980882229.

The spelling of 61816398 in words is "sixty-one million, eight hundred sixteen thousand, three hundred ninety-eight".