61819492 has 48 divisors (see below), whose sum is σ = 131281920. Its totient is φ = 24897312.

The previous prime is 61819481. The next prime is 61819507. The reversal of 61819492 is 29491816.

It is a super-2 number, since 2×61819492² = 7643299182276128, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 37183 + ... + 38809.

It is an arithmetic number, because the mean of its divisors is an integer number (2735040).

Almost surely, 2^61819492 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 61819492, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (65640960).

61819492 is an abundant number, since it is smaller than the sum of its proper divisors (69462428).

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

61819492 is a wasteful number, since it uses less digits than its factorization.

61819492 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1720 (or 1718 counting only the distinct ones).

The product of its digits is 31104, while the sum is 40.

The square root of 61819492 is about 7862.5372495143. The cubic root of 61819492 is about 395.4046848613.

The spelling of 61819492 in words is "sixty-one million, eight hundred nineteen thousand, four hundred ninety-two".