61989744 has 20 divisors (see below), whose sum is σ = 160140296. Its totient is φ = 20663232.

The previous prime is 61989737. The next prime is 61989749. The reversal of 61989744 is 44798916.

It is a super-2 number, since 2×61989744² = 7685456722371072, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (48), and also a Moran number because the ratio is a prime number: 1291453 = 61989744 / (6 + 1 + 9 + 8 + 9 + 7 + 4 + 4).

It is a junction number, because it is equal to n+sod(n) for n = 61989693 and 61989702.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61989749) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 645679 + ... + 645774.

Almost surely, 2^61989744 is an apocalyptic number.

It is an amenable number.

61989744 is an abundant number, since it is smaller than the sum of its proper divisors (98150552).

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

61989744 is a wasteful number, since it uses less digits than its factorization.

61989744 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1291464 (or 1291458 counting only the distinct ones).

The product of its digits is 435456, while the sum is 48.

The square root of 61989744 is about 7873.3565904257. The cubic root of 61989744 is about 395.7673360354.

It can be divided in two parts, 619897 and 44, that added together give a triangular number (619941 = T₁₁₁₃).

The spelling of 61989744 in words is "sixty-one million, nine hundred eighty-nine thousand, seven hundred forty-four".