61409220 has 24 divisors (see below), whose sum is σ = 171945984. Its totient is φ = 16375776.

The previous prime is 61409209. The next prime is 61409221. The reversal of 61409220 is 2290416.

It is not an unprimeable number, because it can be changed into a prime (61409221) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 511684 + ... + 511803.

It is an arithmetic number, because the mean of its divisors is an integer number (7164416).

Almost surely, 2^61409220 is an apocalyptic number.

61409220 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

61409220 is an abundant number, since it is smaller than the sum of its proper divisors (110536764).

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

61409220 is a wasteful number, since it uses less digits than its factorization.

61409220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1023499 (or 1023497 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 24.

The square root of 61409220 is about 7836.4035118159. The cubic root of 61409220 is about 394.5280267822.

Adding to 61409220 its reverse (2290416), we get a palindrome (63699636).

The spelling of 61409220 in words is "sixty-one million, four hundred nine thousand, two hundred twenty".