61597866 has 16 divisors (see below), whose sum is σ = 134395488. Its totient is φ = 18666000.

The previous prime is 61597831. The next prime is 61597873. The reversal of 61597866 is 66879516.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 466585 + ... + 466716.

It is an arithmetic number, because the mean of its divisors is an integer number (8399718).

Almost surely, 2^61597866 is an apocalyptic number.

61597866 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

61597866 is an abundant number, since it is smaller than the sum of its proper divisors (72797622).

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

61597866 is a wasteful number, since it uses less digits than its factorization.

61597866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 933317.

The product of its digits is 544320, while the sum is 48.

The square root of 61597866 is about 7848.4307985737. The cubic root of 61597866 is about 394.9316038174.

The spelling of 61597866 in words is "sixty-one million, five hundred ninety-seven thousand, eight hundred sixty-six".