61721230 has 8 divisors (see below), whose sum is σ = 111098232. Its totient is φ = 24688488.

The previous prime is 61721221. The next prime is 61721263. The reversal of 61721230 is 3212716.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3086052 + ... + 3086071.

It is an arithmetic number, because the mean of its divisors is an integer number (13887279).

Almost surely, 2^61721230 is an apocalyptic number.

61721230 is a deficient number, since it is larger than the sum of its proper divisors (49377002).

61721230 is a wasteful number, since it uses less digits than its factorization.

61721230 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6172130.

The product of its (nonzero) digits is 504, while the sum is 22.

The square root of 61721230 is about 7856.2860182150. The cubic root of 61721230 is about 395.1950753578.

Adding to 61721230 its reverse (3212716), we get a palindrome (64933946).

The spelling of 61721230 in words is "sixty-one million, seven hundred twenty-one thousand, two hundred thirty".