61571707240 has 64 divisors (see below), whose sum is σ = 139656441600. Its totient is φ = 24429838848.

The previous prime is 61571707231. The next prime is 61571707247. The reversal of 61571707240 is 4270717516.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a junction number, because it is equal to n+sod(n) for n = 61571707193 and 61571707202.

It is not an unprimeable number, because it can be changed into a prime (61571707247) 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, 8539717 + ... + 8546923.

It is an arithmetic number, because the mean of its divisors is an integer number (2182131900).

Almost surely, 2^61571707240 is an apocalyptic number.

It is an amenable number.

61571707240 is an abundant number, since it is smaller than the sum of its proper divisors (78084734360).

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

61571707240 is a wasteful number, since it uses less digits than its factorization.

61571707240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8914 (or 8910 counting only the distinct ones).

The product of its (nonzero) digits is 82320, while the sum is 40.

The spelling of 61571707240 in words is "sixty-one billion, five hundred seventy-one million, seven hundred seven thousand, two hundred forty".