61820890 has 32 divisors (see below), whose sum is σ = 113472576. Its totient is φ = 24245760.

The previous prime is 61820881. The next prime is 61820893. The reversal of 61820890 is 9802816.

It is not an unprimeable number, because it can be changed into a prime (61820893) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 174954 + ... + 175306.

It is an arithmetic number, because the mean of its divisors is an integer number (3546018).

Almost surely, 2^61820890 is an apocalyptic number.

61820890 is a deficient number, since it is larger than the sum of its proper divisors (51651686).

61820890 is a wasteful number, since it uses less digits than its factorization.

61820890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 654.

The product of its (nonzero) digits is 6912, while the sum is 34.

The square root of 61820890 is about 7862.6261516112. The cubic root of 61820890 is about 395.4076654292.

The spelling of 61820890 in words is "sixty-one million, eight hundred twenty thousand, eight hundred ninety".