61817994 has 24 divisors (see below), whose sum is σ = 153073440. Its totient is φ = 17662248.

The previous prime is 61817993. The next prime is 61818007. The reversal of 61817994 is 49971816.

It is a happy number.

61817994 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-3 number, since 3×61817994³ (a number of 24 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (61817993) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 245184 + ... + 245435.

It is an arithmetic number, because the mean of its divisors is an integer number (6378060).

Almost surely, 2^61817994 is an apocalyptic number.

61817994 is an abundant number, since it is smaller than the sum of its proper divisors (91255446).

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

61817994 is a wasteful number, since it uses less digits than its factorization.

61817994 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 490634 (or 490631 counting only the distinct ones).

The product of its digits is 108864, while the sum is 45.

The square root of 61817994 is about 7862.4419870674. The cubic root of 61817994 is about 395.4014910413.

The spelling of 61817994 in words is "sixty-one million, eight hundred seventeen thousand, nine hundred ninety-four".