61077890 has 16 divisors (see below), whose sum is σ = 110187000. Its totient is φ = 24376320.

The previous prime is 61077883. The next prime is 61077911. The reversal of 61077890 is 9877016.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 36881329 + 24196561 = 6073^2 + 4919^2 .

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, 2015 + ... + 11234.

Almost surely, 2^61077890 is an apocalyptic number.

61077890 is a deficient number, since it is larger than the sum of its proper divisors (49109110).

61077890 is a wasteful number, since it uses less digits than its factorization.

61077890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13717.

The product of its (nonzero) digits is 21168, while the sum is 38.

The square root of 61077890 is about 7815.2344814471. The cubic root of 61077890 is about 393.8171955531.

The spelling of 61077890 in words is "sixty-one million, seventy-seven thousand, eight hundred ninety".