61228890 has 24 divisors (see below), whose sum is σ = 159195348. Its totient is φ = 16327680.

The previous prime is 61228879. The next prime is 61228903. The reversal of 61228890 is 9882216.

It can be written as a sum of positive squares in 2 ways, for example, as 58476609 + 2752281 = 7647^2 + 1659^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 340071 + ... + 340250.

Almost surely, 2^61228890 is an apocalyptic number.

61228890 is an abundant number, since it is smaller than the sum of its proper divisors (97966458).

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

61228890 is a wasteful number, since it uses less digits than its factorization.

61228890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 680334 (or 680331 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 36.

The square root of 61228890 is about 7824.8891365948. The cubic root of 61228890 is about 394.1414670607.

The spelling of 61228890 in words is "sixty-one million, two hundred twenty-eight thousand, eight hundred ninety".