61642620 has 120 divisors (see below), whose sum is σ = 208321344. Its totient is φ = 15168384.

The previous prime is 61642597. The next prime is 61642643. The reversal of 61642620 is 2624616.

It is a happy number.

61642620 is a `hidden beast` number, since 616 + 4 + 26 + 20 = 666.

It is an interprime number because it is at equal distance from previous prime (61642597) and next prime (61642643).

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 39 ways as a sum of consecutive naturals, for example, 19597 + ... + 22523.

Almost surely, 2^61642620 is an apocalyptic number.

61642620 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 61642620, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (104160672).

61642620 is an abundant number, since it is smaller than the sum of its proper divisors (146678724).

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

61642620 is a wasteful number, since it uses less digits than its factorization.

61642620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2961 (or 2950 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 27.

The square root of 61642620 is about 7851.2814240734. The cubic root of 61642620 is about 395.0272266657.

The spelling of 61642620 in words is "sixty-one million, six hundred forty-two thousand, six hundred twenty".