61122640 has 40 divisors (see below), whose sum is σ = 142622568. Its totient is φ = 24360960.

The previous prime is 61122613. The next prime is 61122641. The reversal of 61122640 is 4622116.

It can be written as a sum of positive squares in 4 ways, for example, as 4210704 + 56911936 = 2052^2 + 7544^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61122641) 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, 23820 + ... + 26260.

Almost surely, 2^61122640 is an apocalyptic number.

It is an amenable number.

61122640 is an abundant number, since it is smaller than the sum of its proper divisors (81499928).

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

61122640 is a wasteful number, since it uses less digits than its factorization.

61122640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2767 (or 2761 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 22.

The square root of 61122640 is about 7818.0969551420. The cubic root of 61122640 is about 393.9133515556.

Adding to 61122640 its reverse (4622116), we get a palindrome (65744756).

The spelling of 61122640 in words is "sixty-one million, one hundred twenty-two thousand, six hundred forty".