61078320 has 80 divisors (see below), whose sum is σ = 210388320. Its totient is φ = 16286976.

The previous prime is 61078309. The next prime is 61078327. The reversal of 61078320 is 2387016.

It is a tau number, because it is divible by the number of its divisors (80).

It is a super-2 number, since 2×61078320² = 7461122348044800, which contains 22 as substring.

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

It is not an unprimeable number, because it can be changed into a prime (61078327) 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, 11979 + ... + 16298.

It is an arithmetic number, because the mean of its divisors is an integer number (2629854).

Almost surely, 2^61078320 is an apocalyptic number.

61078320 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

61078320 is an abundant number, since it is smaller than the sum of its proper divisors (149310000).

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

61078320 is a wasteful number, since it uses less digits than its factorization.

61078320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28299 (or 28287 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 27.

The square root of 61078320 is about 7815.2619917697. The cubic root of 61078320 is about 393.8181197337.

The spelling of 61078320 in words is "sixty-one million, seventy-eight thousand, three hundred twenty".