61655240 has 16 divisors (see below), whose sum is σ = 138724380. Its totient is φ = 24662080.

The previous prime is 61655207. The next prime is 61655317. The reversal of 61655240 is 4255616.

It can be written as a sum of positive squares in 2 ways, for example, as 60248644 + 1406596 = 7762^2 + 1186^2 .

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, 770651 + ... + 770730.

Almost surely, 2^61655240 is an apocalyptic number.

It is an amenable number.

61655240 is an abundant number, since it is smaller than the sum of its proper divisors (77069140).

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

61655240 is a wasteful number, since it uses less digits than its factorization.

61655240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1541392 (or 1541388 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 29.

The square root of 61655240 is about 7852.0850734057. The cubic root of 61655240 is about 395.0541826010.

The spelling of 61655240 in words is "sixty-one million, six hundred fifty-five thousand, two hundred forty".