61306290 has 96 divisors (see below), whose sum is σ = 167469120. Its totient is φ = 15539328.

The previous prime is 61306279. The next prime is 61306309. The reversal of 61306290 is 9260316.

It is a happy number.

61306290 is a `hidden beast` number, since 6 + 1 + 30 + 629 + 0 = 666.

It is a super-2 number, since 2×61306290² = 7516922387128200, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 216489 + ... + 216771.

It is an arithmetic number, because the mean of its divisors is an integer number (1744470).

Almost surely, 2^61306290 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 61306290, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (83734560).

61306290 is an abundant number, since it is smaller than the sum of its proper divisors (106162830).

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

61306290 is a wasteful number, since it uses less digits than its factorization.

61306290 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 408 (or 405 counting only the distinct ones).

The product of its (nonzero) digits is 1944, while the sum is 27.

The square root of 61306290 is about 7829.8333315595. The cubic root of 61306290 is about 394.3074764071.

The spelling of 61306290 in words is "sixty-one million, three hundred six thousand, two hundred ninety".