61820690 has 8 divisors (see below), whose sum is σ = 111277260. Its totient is φ = 24728272.

The previous prime is 61820683. The next prime is 61820701. The reversal of 61820690 is 9602816.

It can be written as a sum of positive squares in 2 ways, for example, as 61136761 + 683929 = 7819^2 + 827^2 .

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

It is a super-2 number, since 2×61820690² = 7643595424152200, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3091025 + ... + 3091044.

Almost surely, 2^61820690 is an apocalyptic number.

61820690 is a deficient number, since it is larger than the sum of its proper divisors (49456570).

61820690 is a wasteful number, since it uses less digits than its factorization.

61820690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6182076.

The product of its (nonzero) digits is 5184, while the sum is 32.

The square root of 61820690 is about 7862.6134332040. The cubic root of 61820690 is about 395.4072390274.

The spelling of 61820690 in words is "sixty-one million, eight hundred twenty thousand, six hundred ninety".