61899420 has 48 divisors (see below), whose sum is σ = 189076608. Its totient is φ = 15005760.

The previous prime is 61899407. The next prime is 61899421. The reversal of 61899420 is 2499816.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61899421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 46234 + ... + 47553.

It is an arithmetic number, because the mean of its divisors is an integer number (3939096).

Almost surely, 2^61899420 is an apocalyptic number.

61899420 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

61899420 is an abundant number, since it is smaller than the sum of its proper divisors (127177188).

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

61899420 is a wasteful number, since it uses less digits than its factorization.

61899420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93810 (or 93808 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 39.

The square root of 61899420 is about 7867.6184452476. The cubic root of 61899420 is about 395.5750210768.

The spelling of 61899420 in words is "sixty-one million, eight hundred ninety-nine thousand, four hundred twenty".