61091604 has 48 divisors (see below), whose sum is σ = 181014400. Its totient is φ = 17454528.

The previous prime is 61091581. The next prime is 61091617. The reversal of 61091604 is 40619016.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 39649 + ... + 41160.

Almost surely, 2^61091604 is an apocalyptic number.

It is an amenable number.

61091604 is an abundant number, since it is smaller than the sum of its proper divisors (119922796).

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

61091604 is a wasteful number, since it uses less digits than its factorization.

61091604 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80829 (or 80821 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 27.

The square root of 61091604 is about 7816.1118211039. Note that the first 3 decimals coincide. The cubic root of 61091604 is about 393.8466683288.

The spelling of 61091604 in words is "sixty-one million, ninety-one thousand, six hundred four".