40767561 has 12 divisors (see below), whose sum is σ = 59716800. Its totient is φ = 26795160.

The previous prime is 40767553. The next prime is 40767563. The reversal of 40767561 is 16576704.

It is not a de Polignac number, because 40767561 - 2³ = 40767553 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (40767563) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 31261 + ... + 32538.

It is an arithmetic number, because the mean of its divisors is an integer number (4976400).

Almost surely, 2^40767561 is an apocalyptic number.

It is an amenable number.

40767561 is a deficient number, since it is larger than the sum of its proper divisors (18949239).

40767561 is a wasteful number, since it uses less digits than its factorization.

40767561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63876 (or 63873 counting only the distinct ones).

The product of its (nonzero) digits is 35280, while the sum is 36.

The square root of 40767561 is about 6384.9480029206. The cubic root of 40767561 is about 344.1688625838.

It can be divided in two parts, 40767 and 561, that added together give a triangular number (41328 = T₂₈₇).

The spelling of 40767561 in words is "forty million, seven hundred sixty-seven thousand, five hundred sixty-one".