61561236 has 24 divisors (see below), whose sum is σ = 156701664. Its totient is φ = 18654880.

The previous prime is 61561231. The next prime is 61561237. The reversal of 61561236 is 63216516.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61561231) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 233055 + ... + 233318.

It is an arithmetic number, because the mean of its divisors is an integer number (6529236).

Almost surely, 2^61561236 is an apocalyptic number.

61561236 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

It is an amenable number.

61561236 is an abundant number, since it is smaller than the sum of its proper divisors (95140428).

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

61561236 is a wasteful number, since it uses less digits than its factorization.

61561236 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 466391 (or 466389 counting only the distinct ones).

The product of its digits is 6480, while the sum is 30.

The square root of 61561236 is about 7846.0968640465. The cubic root of 61561236 is about 394.8533044971.

The spelling of 61561236 in words is "sixty-one million, five hundred sixty-one thousand, two hundred thirty-six".