61570220 has 24 divisors (see below), whose sum is σ = 132793584. Its totient is φ = 23962176.

The previous prime is 61570213. The next prime is 61570273. The reversal of 61570220 is 2207516.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 40862 + ... + 42341.

It is an arithmetic number, because the mean of its divisors is an integer number (5533066).

Almost surely, 2^61570220 is an apocalyptic number.

It is an amenable number.

61570220 is an abundant number, since it is smaller than the sum of its proper divisors (71223364).

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

61570220 is a wasteful number, since it uses less digits than its factorization.

61570220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83249 (or 83247 counting only the distinct ones).

The product of its (nonzero) digits is 840, while the sum is 23.

The square root of 61570220 is about 7846.6693571222. The cubic root of 61570220 is about 394.8725113322.

Adding to 61570220 its reverse (2207516), we get a palindrome (63777736).

The spelling of 61570220 in words is "sixty-one million, five hundred seventy thousand, two hundred twenty".