61990656 has 144 divisors (see below), whose sum is σ = 203288064. Its totient is φ = 16330752.

The previous prime is 61990637. The next prime is 61990657. The reversal of 61990656 is 65609916.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a zygodrome in base 5.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61990657) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 69445 + ... + 70331.

Almost surely, 2^61990656 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 61990656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (101644032).

61990656 is an abundant number, since it is smaller than the sum of its proper divisors (141297408).

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

61990656 is a wasteful number, since it uses less digits than its factorization.

61990656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 926 (or 912 counting only the distinct ones).

The product of its (nonzero) digits is 87480, while the sum is 42.

The square root of 61990656 is about 7873.4145070611. The cubic root of 61990656 is about 395.7692768835.

It can be divided in two parts, 6 and 1990656, that multiplied together give a square (11943936 = 3456²).

The spelling of 61990656 in words is "sixty-one million, nine hundred ninety thousand, six hundred fifty-six".