61660767 has 32 divisors (see below), whose sum is σ = 99020800. Its totient is φ = 34080480.

The previous prime is 61660657. The next prime is 61660777. The reversal of 61660767 is 76706616.

It is not a de Polignac number, because 61660767 - 2⁷ = 61660639 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 (61660777) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 30933 + ... + 32865.

It is an arithmetic number, because the mean of its divisors is an integer number (3094400).

Almost surely, 2^61660767 is an apocalyptic number.

61660767 is a deficient number, since it is larger than the sum of its proper divisors (37360033).

61660767 is a wasteful number, since it uses less digits than its factorization.

61660767 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1988 (or 1974 counting only the distinct ones).

The product of its (nonzero) digits is 63504, while the sum is 39.

The square root of 61660767 is about 7852.4370102536. The cubic root of 61660767 is about 395.0659869463.

The spelling of 61660767 in words is "sixty-one million, six hundred sixty thousand, seven hundred sixty-seven".