61283643 has 16 divisors (see below), whose sum is σ = 85658496. Its totient is φ = 38928960.

The previous prime is 61283639. The next prime is 61283653. The reversal of 61283643 is 34638216.

It is not a de Polignac number, because 61283643 - 2² = 61283639 is a prime.

It is not an unprimeable number, because it can be changed into a prime (61283603) 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, 505 + ... + 11082.

It is an arithmetic number, because the mean of its divisors is an integer number (5353656).

Almost surely, 2^61283643 is an apocalyptic number.

61283643 is a deficient number, since it is larger than the sum of its proper divisors (24374853).

61283643 is a wasteful number, since it uses less digits than its factorization.

61283643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11674.

The product of its digits is 20736, while the sum is 33.

The square root of 61283643 is about 7828.3869986096. The cubic root of 61283643 is about 394.2589170546.

It can be divided in two parts, 612 and 83643, that added together give a triangular number (84255 = T₄₁₀).

The spelling of 61283643 in words is "sixty-one million, two hundred eighty-three thousand, six hundred forty-three".