61901690 has 8 divisors (see below), whose sum is σ = 111423060. Its totient is φ = 24760672.

The previous prime is 61901683. The next prime is 61901701. The reversal of 61901690 is 9610916.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 55785961 + 6115729 = 7469^2 + 2473^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×61901690² = 7663638449712200, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3095075 + ... + 3095094.

Almost surely, 2^61901690 is an apocalyptic number.

61901690 is a deficient number, since it is larger than the sum of its proper divisors (49521370).

61901690 is a wasteful number, since it uses less digits than its factorization.

61901690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6190176.

The product of its (nonzero) digits is 2916, while the sum is 32.

The square root of 61901690 is about 7867.7627061319. The cubic root of 61901690 is about 395.5798565789.

The spelling of 61901690 in words is "sixty-one million, nine hundred one thousand, six hundred ninety".