61420920 has 256 divisors, whose sum is σ = 221184000. Its totient is φ = 13478400.

The previous prime is 61420873. The next prime is 61420921. The reversal of 61420920 is 2902416.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61420921) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 777441 + ... + 777519.

It is an arithmetic number, because the mean of its divisors is an integer number (864000).

Almost surely, 2^61420920 is an apocalyptic number.

61420920 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 61420920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (110592000).

61420920 is an abundant number, since it is smaller than the sum of its proper divisors (159763080).

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

61420920 is a wasteful number, since it uses less digits than its factorization.

61420920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 154 (or 150 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 24.

The square root of 61420920 is about 7837.1499921847. The cubic root of 61420920 is about 394.5530810264.

The spelling of 61420920 in words is "sixty-one million, four hundred twenty thousand, nine hundred twenty".