60991785 has 56 divisors (see below), whose sum is σ = 113715720. Its totient is φ = 31352832.

The previous prime is 60991783. The next prime is 60991793. The reversal of 60991785 is 58719906.

It can be written as a sum of positive squares in 4 ways, for example, as 24413481 + 36578304 = 4941^2 + 6048^2 .

It is not a de Polignac number, because 60991785 - 2¹ = 60991783 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 60991785.

It is not an unprimeable number, because it can be changed into a prime (60991783) by changing a digit.

It is a polite number, since it can be written in 55 ways as a sum of consecutive naturals, for example, 105417 + ... + 105993.

Almost surely, 2^60991785 is an apocalyptic number.

It is an amenable number.

60991785 is a deficient number, since it is larger than the sum of its proper divisors (52723935).

60991785 is an equidigital number, since it uses as much as digits as its factorization.

60991785 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 629 (or 614 counting only the distinct ones).

The product of its (nonzero) digits is 136080, while the sum is 45.

The square root of 60991785 is about 7809.7237467147. The cubic root of 60991785 is about 393.6320463014.

It can be divided in two parts, 60991 and 785, that added together give a triangular number (61776 = T₃₅₁).

The spelling of 60991785 in words is "sixty million, nine hundred ninety-one thousand, seven hundred eighty-five".