61355240 has 16 divisors (see below), whose sum is σ = 138049380. Its totient is φ = 24542080.

The previous prime is 61355219. The next prime is 61355267. The reversal of 61355240 is 4255316.

It can be written as a sum of positive squares in 2 ways, for example, as 60310756 + 1044484 = 7766^2 + 1022^2 .

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, 766901 + ... + 766980.

Almost surely, 2^61355240 is an apocalyptic number.

It is an amenable number.

61355240 is an abundant number, since it is smaller than the sum of its proper divisors (76694140).

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

61355240 is a wasteful number, since it uses less digits than its factorization.

61355240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1533892 (or 1533888 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 26.

The square root of 61355240 is about 7832.9585725957. The cubic root of 61355240 is about 394.4123934077.

The spelling of 61355240 in words is "sixty-one million, three hundred fifty-five thousand, two hundred forty".