61989215 has 8 divisors (see below), whose sum is σ = 74887200. Its totient is φ = 49257952.

The previous prime is 61989199. The next prime is 61989247. The reversal of 61989215 is 51298916.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 61989215 - 2⁴ = 61989199 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 40859 + ... + 42348.

It is an arithmetic number, because the mean of its divisors is an integer number (9360900).

Almost surely, 2^61989215 is an apocalyptic number.

61989215 is a deficient number, since it is larger than the sum of its proper divisors (12897985).

61989215 is a wasteful number, since it uses less digits than its factorization.

61989215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83361.

The product of its digits is 38880, while the sum is 41.

The square root of 61989215 is about 7873.3229960418. The cubic root of 61989215 is about 395.7662102496.

The spelling of 61989215 in words is "sixty-one million, nine hundred eighty-nine thousand, two hundred fifteen".