61820860 has 24 divisors (see below), whose sum is σ = 130304160. Its totient is φ = 24636864.

The previous prime is 61820827. The next prime is 61820861. The reversal of 61820860 is 6802816.

It is a super-2 number, since 2×61820860² = 7643637462279200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61820861) 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, 40 + ... + 11119.

It is an arithmetic number, because the mean of its divisors is an integer number (5429340).

Almost surely, 2^61820860 is an apocalyptic number.

It is an amenable number.

61820860 is an abundant number, since it is smaller than the sum of its proper divisors (68483300).

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

61820860 is a wasteful number, since it uses less digits than its factorization.

61820860 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11445 (or 11443 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 31.

The square root of 61820860 is about 7862.6242438514. The cubic root of 61820860 is about 395.4076014690.

The spelling of 61820860 in words is "sixty-one million, eight hundred twenty thousand, eight hundred sixty".