61507212 has 48 divisors (see below), whose sum is σ = 155537760. Its totient is φ = 18917184.

The previous prime is 61507211. The next prime is 61507219. The reversal of 61507212 is 21270516.

It is a nialpdrome in base 13.

It is not an unprimeable number, because it can be changed into a prime (61507211) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 25198 + ... + 27530.

It is an arithmetic number, because the mean of its divisors is an integer number (3240370).

Almost surely, 2^61507212 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 61507212, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (77768880).

61507212 is an abundant number, since it is smaller than the sum of its proper divisors (94030548).

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

61507212 is a wasteful number, since it uses less digits than its factorization.

61507212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2379 (or 2351 counting only the distinct ones).

The product of its (nonzero) digits is 840, while the sum is 24.

The square root of 61507212 is about 7842.6533775247. The cubic root of 61507212 is about 394.7377675169.

Adding to 61507212 its reverse (21270516), we get a palindrome (82777728).

The spelling of 61507212 in words is "sixty-one million, five hundred seven thousand, two hundred twelve".