61387228 has 48 divisors (see below), whose sum is σ = 126214144. Its totient is φ = 25583040.

The previous prime is 61387213. The next prime is 61387241. The reversal of 61387228 is 82278316.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 216775 + ... + 217057.

Almost surely, 2^61387228 is an apocalyptic number.

It is an amenable number.

61387228 is an abundant number, since it is smaller than the sum of its proper divisors (64826916).

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

61387228 is a wasteful number, since it uses less digits than its factorization.

61387228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 482 (or 480 counting only the distinct ones).

The product of its digits is 32256, while the sum is 37.

The square root of 61387228 is about 7835.0001914486. Note that the first 3 decimals coincide. The cubic root of 61387228 is about 394.4809247546.

It can be divided in two parts, 6138 and 7228, that added together give a triangular number (13366 = T₁₆₃).

The spelling of 61387228 in words is "sixty-one million, three hundred eighty-seven thousand, two hundred twenty-eight".