61820810 has 8 divisors (see below), whose sum is σ = 111277476. Its totient is φ = 24728320.

The previous prime is 61820809. The next prime is 61820819. The reversal of 61820810 is 1802816.

It can be written as a sum of positive squares in 2 ways, for example, as 56896849 + 4923961 = 7543^2 + 2219^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×61820810² = 7643625098112200, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 61820810.

It is not an unprimeable number, because it can be changed into a prime (61820819) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3091031 + ... + 3091050.

Almost surely, 2^61820810 is an apocalyptic number.

61820810 is a deficient number, since it is larger than the sum of its proper divisors (49456666).

61820810 is a wasteful number, since it uses less digits than its factorization.

61820810 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6182088.

The product of its (nonzero) digits is 768, while the sum is 26.

The square root of 61820810 is about 7862.6210642508. The cubic root of 61820810 is about 395.4074948686.

The spelling of 61820810 in words is "sixty-one million, eight hundred twenty thousand, eight hundred ten".