61507877 has 4 divisors (see below), whose sum is σ = 61595340. Its totient is φ = 61420416.

The previous prime is 61507871. The next prime is 61507879. The reversal of 61507877 is 77870516.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 18395521 + 43112356 = 4289^2 + 6566^2 .

It is a cyclic number.

It is not a de Polignac number, because 61507877 - 2⁴ = 61507861 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61507871) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 42668 + ... + 44085.

It is an arithmetic number, because the mean of its divisors is an integer number (15398835).

Almost surely, 2^61507877 is an apocalyptic number.

It is an amenable number.

61507877 is a deficient number, since it is larger than the sum of its proper divisors (87463).

61507877 is an equidigital number, since it uses as much as digits as its factorization.

61507877 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87462.

The product of its (nonzero) digits is 82320, while the sum is 41.

The square root of 61507877 is about 7842.6957737757. The cubic root of 61507877 is about 394.7391901125.

The spelling of 61507877 in words is "sixty-one million, five hundred seven thousand, eight hundred seventy-seven".