61617020 has 24 divisors (see below), whose sum is σ = 130609584. Its totient is φ = 24415616.

The previous prime is 61617001. The next prime is 61617041. The reversal of 61617020 is 2071616.

It is a congruent number.

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, 12257 + ... + 16536.

It is an arithmetic number, because the mean of its divisors is an integer number (5442066).

Almost surely, 2^61617020 is an apocalyptic number.

It is an amenable number.

61617020 is an abundant number, since it is smaller than the sum of its proper divisors (68992564).

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

61617020 is a wasteful number, since it uses less digits than its factorization.

61617020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28909 (or 28907 counting only the distinct ones).

The product of its (nonzero) digits is 504, while the sum is 23.

The square root of 61617020 is about 7849.6509476537. The cubic root of 61617020 is about 394.9725345428.

Adding to 61617020 its reverse (2071616), we get a palindrome (63688636).

The spelling of 61617020 in words is "sixty-one million, six hundred seventeen thousand, twenty".