61355890 has 32 divisors (see below), whose sum is σ = 117514800. Its totient is φ = 22984704.

The previous prime is 61355887. The next prime is 61355891. The reversal of 61355890 is 9855316.

It is a Cunningham number, because it is equal to 7833²+1.

It can be written as a sum of positive squares in 8 ways, for example, as 20766249 + 40589641 = 4557^2 + 6371^2 .

It is not an unprimeable number, because it can be changed into a prime (61355891) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 38836 + ... + 40384.

Almost surely, 2^61355890 is an apocalyptic number.

61355890 is a deficient number, since it is larger than the sum of its proper divisors (56158910).

61355890 is a wasteful number, since it uses less digits than its factorization.

61355890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1806.

The product of its (nonzero) digits is 32400, while the sum is 37.

The square root of 61355890 is about 7833.0000638325. Note that the first 4 decimals coincide. The cubic root of 61355890 is about 394.4137862099.

The spelling of 61355890 in words is "sixty-one million, three hundred fifty-five thousand, eight hundred ninety".