61766090 has 16 divisors (see below), whose sum is σ = 113891400. Its totient is φ = 24103680.

The previous prime is 61766087. The next prime is 61766101. The reversal of 61766090 is 9066716.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 36132121 + 25633969 = 6011^2 + 5063^2 .

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 61766090.

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, 74915 + ... + 75734.

Almost surely, 2^61766090 is an apocalyptic number.

61766090 is a deficient number, since it is larger than the sum of its proper divisors (52125310).

61766090 is a wasteful number, since it uses less digits than its factorization.

61766090 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 150697.

The product of its (nonzero) digits is 13608, while the sum is 35.

The square root of 61766090 is about 7859.1405382523. The cubic root of 61766090 is about 395.2907969202.

Subtracting from 61766090 its sum of digits (35), we obtain a triangular number (61766055 = T₁₁₁₁₄).

The spelling of 61766090 in words is "sixty-one million, seven hundred sixty-six thousand, ninety".