61577790 has 32 divisors (see below), whose sum is σ = 148625280. Its totient is φ = 16327584.

The previous prime is 61577779. The next prime is 61577797. The reversal of 61577790 is 9777516.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61577797) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 364 + ... + 11103.

It is an arithmetic number, because the mean of its divisors is an integer number (4644540).

Almost surely, 2^61577790 is an apocalyptic number.

61577790 is an abundant number, since it is smaller than the sum of its proper divisors (87047490).

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

61577790 is a wasteful number, since it uses less digits than its factorization.

61577790 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11656.

The product of its (nonzero) digits is 92610, while the sum is 42.

The square root of 61577790 is about 7847.1517125642. The cubic root of 61577790 is about 394.8886937356. Note that the first 3 decimals are identical.

The spelling of 61577790 in words is "sixty-one million, five hundred seventy-seven thousand, seven hundred ninety".