61379720 has 32 divisors (see below), whose sum is σ = 139480920. Its totient is φ = 24307200.

The previous prime is 61379719. The next prime is 61379723. The reversal of 61379720 is 2797316.

It can be written as a sum of positive squares in 4 ways, for example, as 59876644 + 1503076 = 7738^2 + 1226^2 .

It is a super-4 number, since 4×61379720⁴ (a number of 32 digits) contains 4444 as substring.

It is not an unprimeable number, because it can be changed into a prime (61379723) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3557 + ... + 11636.

Almost surely, 2^61379720 is an apocalyptic number.

It is an amenable number.

61379720 is an abundant number, since it is smaller than the sum of its proper divisors (78101200).

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

61379720 is a wasteful number, since it uses less digits than its factorization.

61379720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15305 (or 15301 counting only the distinct ones).

The product of its (nonzero) digits is 15876, while the sum is 35.

The square root of 61379720 is about 7834.5210447098. The cubic root of 61379720 is about 394.4648416939.

The spelling of 61379720 in words is "sixty-one million, three hundred seventy-nine thousand, seven hundred twenty".