61321700 has 72 divisors (see below), whose sum is σ = 146803104. Its totient is φ = 22048000.

The previous prime is 61321661. The next prime is 61321717. The reversal of 61321700 is 712316.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 117440 + ... + 117960.

It is an arithmetic number, because the mean of its divisors is an integer number (2038932).

Almost surely, 2^61321700 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 61321700, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (73401552).

61321700 is an abundant number, since it is smaller than the sum of its proper divisors (85481404).

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

61321700 is a wasteful number, since it uses less digits than its factorization.

61321700 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 653 (or 646 counting only the distinct ones).

The product of its (nonzero) digits is 252, while the sum is 20.

The square root of 61321700 is about 7830.8173264353. The cubic root of 61321700 is about 394.3405114577.

The spelling of 61321700 in words is "sixty-one million, three hundred twenty-one thousand, seven hundred".