61370781 has 8 divisors (see below), whose sum is σ = 82813920. Its totient is φ = 40420752.

The previous prime is 61370759. The next prime is 61370801. The reversal of 61370781 is 18707316.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 61370781 - 2⁷ = 61370653 is a prime.

It is a super-2 number, since 2×61370781² = 7532745521099922, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61370711) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 122986 + ... + 123483.

It is an arithmetic number, because the mean of its divisors is an integer number (10351740).

Almost surely, 2^61370781 is an apocalyptic number.

It is an amenable number.

61370781 is a deficient number, since it is larger than the sum of its proper divisors (21443139).

61370781 is a wasteful number, since it uses less digits than its factorization.

61370781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 246555.

The product of its (nonzero) digits is 7056, while the sum is 33.

The square root of 61370781 is about 7833.9505359684. The cubic root of 61370781 is about 394.4456915446.

The spelling of 61370781 in words is "sixty-one million, three hundred seventy thousand, seven hundred eighty-one".