61685790 has 16 divisors (see below), whose sum is σ = 148045968. Its totient is φ = 16449536.

The previous prime is 61685783. The next prime is 61685791. The reversal of 61685790 is 9758616.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61685791) 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, 1028067 + ... + 1028126.

It is an arithmetic number, because the mean of its divisors is an integer number (9252873).

Almost surely, 2^61685790 is an apocalyptic number.

61685790 is an abundant number, since it is smaller than the sum of its proper divisors (86360178).

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

61685790 is a wasteful number, since it uses less digits than its factorization.

61685790 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2056203.

The product of its (nonzero) digits is 90720, while the sum is 42.

The square root of 61685790 is about 7854.0301756487. The cubic root of 61685790 is about 395.1194212434.

The spelling of 61685790 in words is "sixty-one million, six hundred eighty-five thousand, seven hundred ninety".