61631394 has 16 divisors (see below), whose sum is σ = 134468640. Its totient is φ = 18676160.

The previous prime is 61631393. The next prime is 61631399. The reversal of 61631394 is 49313616.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is not an unprimeable number, because it can be changed into a prime (61631393) 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, 466839 + ... + 466970.

It is an arithmetic number, because the mean of its divisors is an integer number (8404290).

Almost surely, 2^61631394 is an apocalyptic number.

61631394 is an abundant number, since it is smaller than the sum of its proper divisors (72837246).

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

61631394 is a wasteful number, since it uses less digits than its factorization.

61631394 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 933825.

The product of its digits is 11664, while the sum is 33.

The square root of 61631394 is about 7850.5664763761. The cubic root of 61631394 is about 395.0032451798.

It can be divided in two parts, 6163 and 1394, that added together give a palindrome (7557).

The spelling of 61631394 in words is "sixty-one million, six hundred thirty-one thousand, three hundred ninety-four".