61426644 has 48 divisors (see below), whose sum is σ = 153933696. Its totient is φ = 18995200.

The previous prime is 61426637. The next prime is 61426681. The reversal of 61426644 is 44662416.

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

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, 12364 + ... + 16604.

It is an arithmetic number, because the mean of its divisors is an integer number (3206952).

Almost surely, 2^61426644 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 61426644, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (76966848).

61426644 is an abundant number, since it is smaller than the sum of its proper divisors (92507052).

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

61426644 is a wasteful number, since it uses less digits than its factorization.

61426644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4336 (or 4334 counting only the distinct ones).

The product of its digits is 27648, while the sum is 33.

The square root of 61426644 is about 7837.5151674494. The cubic root of 61426644 is about 394.5653371745.

The spelling of 61426644 in words is "sixty-one million, four hundred twenty-six thousand, six hundred forty-four".