61692639 has 16 divisors (see below), whose sum is σ = 87118080. Its totient is φ = 38724480.

The previous prime is 61692637. The next prime is 61692641. The reversal of 61692639 is 93629616.

It is an interprime number because it is at equal distance from previous prime (61692637) and next prime (61692641).

It is not a de Polignac number, because 61692639 - 2¹ = 61692637 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 61692639.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61692637) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6279 + ... + 12759.

It is an arithmetic number, because the mean of its divisors is an integer number (5444880).

Almost surely, 2^61692639 is an apocalyptic number.

61692639 is a deficient number, since it is larger than the sum of its proper divisors (25425441).

61692639 is a wasteful number, since it uses less digits than its factorization.

61692639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6670.

The product of its digits is 104976, while the sum is 42.

The square root of 61692639 is about 7854.4661817338. The cubic root of 61692639 is about 395.1340441291.

The spelling of 61692639 in words is "sixty-one million, six hundred ninety-two thousand, six hundred thirty-nine".