68261520 has 40 divisors (see below), whose sum is σ = 211611456. Its totient is φ = 18203008.

The previous prime is 68261491. The next prime is 68261527. The reversal of 68261520 is 2516286.

It is a tau number, because it is divible by the number of its divisors (40).

It is a super-2 number, since 2×68261520² = 9319270225420800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is not an unprimeable number, because it can be changed into a prime (68261527) 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, 141972 + ... + 142451.

Almost surely, 2^68261520 is an apocalyptic number.

68261520 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

68261520 is an abundant number, since it is smaller than the sum of its proper divisors (143349936).

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

68261520 is a wasteful number, since it uses less digits than its factorization.

68261520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 284439 (or 284433 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 30.

The square root of 68261520 is about 8262.0530136280. The cubic root of 68261520 is about 408.6880930101.

The spelling of 68261520 in words is "sixty-eight million, two hundred sixty-one thousand, five hundred twenty".