61689552 has 20 divisors (see below), whose sum is σ = 159364800. Its totient is φ = 20563168.

The previous prime is 61689547. The next prime is 61689569. The reversal of 61689552 is 25598616.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 642552 + ... + 642647.

It is an arithmetic number, because the mean of its divisors is an integer number (7968240).

Almost surely, 2^61689552 is an apocalyptic number.

It is an amenable number.

61689552 is an abundant number, since it is smaller than the sum of its proper divisors (97675248).

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

61689552 is a wasteful number, since it uses less digits than its factorization.

61689552 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1285210 (or 1285204 counting only the distinct ones).

The product of its digits is 129600, while the sum is 42.

The square root of 61689552 is about 7854.2696668755. The cubic root of 61689552 is about 395.1274533960.

The spelling of 61689552 in words is "sixty-one million, six hundred eighty-nine thousand, five hundred fifty-two".