61477690 has 16 divisors (see below), whose sum is σ = 111757320. Its totient is φ = 24347200.

The previous prime is 61477649. The next prime is 61477697. The reversal of 61477690 is 9677416.

61477690 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 61355889 + 121801 = 7833^2 + 349^2 .

It is a super-2 number, since 2×61477690² = 7559012735472200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (61477697) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 29425 + ... + 31444.

Almost surely, 2^61477690 is an apocalyptic number.

61477690 is a deficient number, since it is larger than the sum of its proper divisors (50279630).

61477690 is a wasteful number, since it uses less digits than its factorization.

61477690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60977.

The product of its (nonzero) digits is 63504, while the sum is 40.

The square root of 61477690 is about 7840.7710080068. The cubic root of 61477690 is about 394.6746024942.

The spelling of 61477690 in words is "sixty-one million, four hundred seventy-seven thousand, six hundred ninety".