61990620 has 48 divisors (see below), whose sum is σ = 173916288. Its totient is φ = 16498240.

The previous prime is 61990613. The next prime is 61990627. The reversal of 61990620 is 2609916.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (61990613) and next prime (61990627).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61990627) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 56275 + ... + 57365.

It is an arithmetic number, because the mean of its divisors is an integer number (3623256).

Almost surely, 2^61990620 is an apocalyptic number.

61990620 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

61990620 is an abundant number, since it is smaller than the sum of its proper divisors (111925668).

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

61990620 is a wasteful number, since it uses less digits than its factorization.

61990620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2050 (or 2048 counting only the distinct ones).

The product of its (nonzero) digits is 5832, while the sum is 33.

The square root of 61990620 is about 7873.4122208862. The cubic root of 61990620 is about 395.7692002714.

The spelling of 61990620 in words is "sixty-one million, nine hundred ninety thousand, six hundred twenty".