61323990 has 96 divisors (see below), whose sum is σ = 184433760. Its totient is φ = 12934656.

The previous prime is 61323989. The next prime is 61323991. The reversal of 61323990 is 9932316.

It is an interprime number because it is at equal distance from previous prime (61323989) and next prime (61323991).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61323991) 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 47 ways as a sum of consecutive naturals, for example, 17506 + ... + 20714.

It is an arithmetic number, because the mean of its divisors is an integer number (1921185).

Almost surely, 2^61323990 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 61323990, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (92216880).

61323990 is an abundant number, since it is smaller than the sum of its proper divisors (123109770).

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

61323990 is a wasteful number, since it uses less digits than its factorization.

61323990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3246 (or 3239 counting only the distinct ones).

The product of its (nonzero) digits is 8748, while the sum is 33.

The square root of 61323990 is about 7830.9635422469. The cubic root of 61323990 is about 394.3454201525.

The spelling of 61323990 in words is "sixty-one million, three hundred twenty-three thousand, nine hundred ninety".