61709990 has 16 divisors (see below), whose sum is σ = 112179600. Its totient is φ = 24439200.

The previous prime is 61709987. The next prime is 61710001. The reversal of 61709990 is 9990716.

It is a happy number.

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, 29540 + ... + 31559.

It is an arithmetic number, because the mean of its divisors is an integer number (7011225).

Almost surely, 2^61709990 is an apocalyptic number.

61709990 is a deficient number, since it is larger than the sum of its proper divisors (50469610).

61709990 is a wasteful number, since it uses less digits than its factorization.

61709990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61207.

The product of its (nonzero) digits is 30618, while the sum is 41.

The square root of 61709990 is about 7855.5706349062. The cubic root of 61709990 is about 395.1710843566.

The spelling of 61709990 in words is "sixty-one million, seven hundred nine thousand, nine hundred ninety".