61291620 has 96 divisors (see below), whose sum is σ = 205376640. Its totient is φ = 15085440.

The previous prime is 61291577. The next prime is 61291661. The reversal of 61291620 is 2619216.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2655 + ... + 11385.

It is an arithmetic number, because the mean of its divisors is an integer number (2139340).

Almost surely, 2^61291620 is an apocalyptic number.

61291620 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 61291620, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (102688320).

61291620 is an abundant number, since it is smaller than the sum of its proper divisors (144085020).

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

61291620 is a wasteful number, since it uses less digits than its factorization.

61291620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8762 (or 8754 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 27.

The square root of 61291620 is about 7828.8964739611. The cubic root of 61291620 is about 394.2760225811.

The spelling of 61291620 in words is "sixty-one million, two hundred ninety-one thousand, six hundred twenty".