61199990 has 16 divisors (see below), whose sum is σ = 110270160. Its totient is φ = 24455520.

The previous prime is 61199981. The next prime is 61199993. The reversal of 61199990 is 9999116.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61199993) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10160 + ... + 15020.

It is an arithmetic number, because the mean of its divisors is an integer number (6891885).

Almost surely, 2^61199990 is an apocalyptic number.

61199990 is a deficient number, since it is larger than the sum of its proper divisors (49070170).

61199990 is a wasteful number, since it uses less digits than its factorization.

61199990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6127.

The product of its (nonzero) digits is 39366, while the sum is 44.

The square root of 61199990 is about 7823.0422471057. The cubic root of 61199990 is about 394.0794457882.

The spelling of 61199990 in words is "sixty-one million, one hundred ninety-nine thousand, nine hundred ninety".