61389288 has 48 divisors (see below), whose sum is σ = 172001700. Its totient is φ = 19756800.

The previous prime is 61389287. The next prime is 61389319. The reversal of 61389288 is 88298316.

61389288 is a `hidden beast` number, since 613 + 8 + 9 + 28 + 8 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 58706244 + 2683044 = 7662^2 + 1638^2 .

It is a super-2 number, since 2×61389288² = 7537289362293888, which contains 22 as substring.

It is a nude number because it is divisible by every one of its digits.

It is not an unprimeable number, because it can be changed into a prime (61389287) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 12613 + ... + 16788.

Almost surely, 2^61389288 is an apocalyptic number.

It is an amenable number.

61389288 is an abundant number, since it is smaller than the sum of its proper divisors (110612412).

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

61389288 is a wasteful number, since it uses less digits than its factorization.

61389288 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29442 (or 29435 counting only the distinct ones).

The product of its digits is 165888, while the sum is 45.

The square root of 61389288 is about 7835.1316517337. The cubic root of 61389288 is about 394.4853372991.

The spelling of 61389288 in words is "sixty-one million, three hundred eighty-nine thousand, two hundred eighty-eight".