61606440 has 256 divisors, whose sum is σ = 243648000. Its totient is φ = 13547520.

The previous prime is 61606439. The next prime is 61606459. The reversal of 61606440 is 4460616.

61606440 is a `hidden beast` number, since 6 + 16 + 0 + 644 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 219100 + ... + 219380.

It is an arithmetic number, because the mean of its divisors is an integer number (951750).

Almost surely, 2^61606440 is an apocalyptic number.

61606440 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 61606440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (121824000).

61606440 is an abundant number, since it is smaller than the sum of its proper divisors (182041560).

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

61606440 is a wasteful number, since it uses less digits than its factorization.

61606440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 337 (or 327 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 27.

The square root of 61606440 is about 7848.9770034062. The cubic root of 61606440 is about 394.9499268898.

The spelling of 61606440 in words is "sixty-one million, six hundred six thousand, four hundred forty".