61488639 has 20 divisors (see below), whose sum is σ = 93593016. Its totient is φ = 40216176.

The previous prime is 61488607. The next prime is 61488659. The reversal of 61488639 is 93688416.

61488639 = 1051² + 1052² + ... + 1103².

61488639 is a `hidden beast` number, since 6 + 1 + 4 + 8 + 8 + 639 = 666.

It is not a de Polignac number, because 61488639 - 2⁵ = 61488607 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 61488594 and 61488603.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61488659) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 2869 + ... + 11454.

Almost surely, 2^61488639 is an apocalyptic number.

61488639 is a deficient number, since it is larger than the sum of its proper divisors (32104377).

61488639 is a wasteful number, since it uses less digits than its factorization.

61488639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14388 (or 14379 counting only the distinct ones).

The product of its digits is 248832, while the sum is 45.

The square root of 61488639 is about 7841.4691863196. The cubic root of 61488639 is about 394.6980312410.

It can be divided in two parts, 614 and 88639, that added together give a triangular number (89253 = T₄₂₂).

The spelling of 61488639 in words is "sixty-one million, four hundred eighty-eight thousand, six hundred thirty-nine".