61222890 has 32 divisors (see below), whose sum is σ = 148101120. Its totient is φ = 16196544.

The previous prime is 61222879. The next prime is 61222937. The reversal of 61222890 is 9822216.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4225 + ... + 11844.

It is an arithmetic number, because the mean of its divisors is an integer number (4628160).

Almost surely, 2^61222890 is an apocalyptic number.

61222890 is an abundant number, since it is smaller than the sum of its proper divisors (86878230).

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

61222890 is a wasteful number, since it uses less digits than its factorization.

61222890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16206.

The product of its (nonzero) digits is 3456, while the sum is 30.

The square root of 61222890 is about 7824.5057351886. The cubic root of 61222890 is about 394.1285922775.

The spelling of 61222890 in words is "sixty-one million, two hundred twenty-two thousand, eight hundred ninety".