61709830 has 64 divisors (see below), whose sum is σ = 144789120. Its totient is φ = 18376704.

The previous prime is 61709827. The next prime is 61709873. The reversal of 61709830 is 3890716.

It is a Harshad number since it is a multiple of its sum of digits (34).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 13476 + ... + 17464.

It is an arithmetic number, because the mean of its divisors is an integer number (2262330).

Almost surely, 2^61709830 is an apocalyptic number.

61709830 is an abundant number, since it is smaller than the sum of its proper divisors (83079290).

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

61709830 is a wasteful number, since it uses less digits than its factorization.

61709830 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4033.

The product of its (nonzero) digits is 9072, while the sum is 34.

The square root of 61709830 is about 7855.5604510436. The cubic root of 61709830 is about 395.1707428266.

The spelling of 61709830 in words is "sixty-one million, seven hundred nine thousand, eight hundred thirty".