61207920 has 160 divisors (see below), whose sum is σ = 216057600. Its totient is φ = 15918336.

The previous prime is 61207907. The next prime is 61207921. The reversal of 61207920 is 2970216.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61207921) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 92551 + ... + 93209.

It is an arithmetic number, because the mean of its divisors is an integer number (1350360).

Almost surely, 2^61207920 is an apocalyptic number.

61207920 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 61207920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (108028800).

61207920 is an abundant number, since it is smaller than the sum of its proper divisors (154849680).

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

61207920 is a wasteful number, since it uses less digits than its factorization.

61207920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 724 (or 712 counting only the distinct ones).

The product of its (nonzero) digits is 1512, while the sum is 27.

The square root of 61207920 is about 7823.5490667599. The cubic root of 61207920 is about 394.0964660254.

The spelling of 61207920 in words is "sixty-one million, two hundred seven thousand, nine hundred twenty".