61809492 has 24 divisors (see below), whose sum is σ = 144439456. Its totient is φ = 20572128.

The previous prime is 61809491. The next prime is 61809493. The reversal of 61809492 is 29490816.

It is an interprime number because it is at equal distance from previous prime (61809491) and next prime (61809493).

It is a self number, because there is not a number n which added to its sum of digits gives 61809492.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61809491) 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, 5283 + ... + 12309.

Almost surely, 2^61809492 is an apocalyptic number.

It is an amenable number.

61809492 is an abundant number, since it is smaller than the sum of its proper divisors (82629964).

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

61809492 is a wasteful number, since it uses less digits than its factorization.

61809492 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7767 (or 7765 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 39.

The square root of 61809492 is about 7861.9012967602. The cubic root of 61809492 is about 395.3833633226.

The spelling of 61809492 in words is "sixty-one million, eight hundred nine thousand, four hundred ninety-two".