616665420 has 384 divisors, whose sum is σ = 2357268480. Its totient is φ = 130775040.

The previous prime is 616665407. The next prime is 616665457. The reversal of 616665420 is 24566616.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

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 127 ways as a sum of consecutive naturals, for example, 3564454 + ... + 3564626.

It is an arithmetic number, because the mean of its divisors is an integer number (6138720).

Almost surely, 2^616665420 is an apocalyptic number.

616665420 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 616665420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1178634240).

616665420 is an abundant number, since it is smaller than the sum of its proper divisors (1740603060).

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

616665420 is a wasteful number, since it uses less digits than its factorization.

616665420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 262 (or 254 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 36.

The square root of 616665420 is about 24832.7489416697. The cubic root of 616665420 is about 851.1704383324.

The spelling of 616665420 in words is "six hundred sixteen million, six hundred sixty-five thousand, four hundred twenty".