61243040 has 24 divisors (see below), whose sum is σ = 144687060. Its totient is φ = 24497152.

The previous prime is 61242977. The next prime is 61243057. The reversal of 61243040 is 4034216.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 60403984 + 839056 = 7772^2 + 916^2 .

It is a Harshad number since it is a multiple of its sum of digits (20).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 191225 + ... + 191544.

Almost surely, 2^61243040 is an apocalyptic number.

It is an amenable number.

61243040 is an abundant number, since it is smaller than the sum of its proper divisors (83444020).

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

61243040 is a wasteful number, since it uses less digits than its factorization.

61243040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 382784 (or 382776 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 20.

The square root of 61243040 is about 7825.7932505274. The cubic root of 61243040 is about 394.1718267606.

Adding to 61243040 its reverse (4034216), we get a palindrome (65277256).

The spelling of 61243040 in words is "sixty-one million, two hundred forty-three thousand, forty".