61620621 has 8 divisors (see below), whose sum is σ = 84994080. Its totient is φ = 39663792.

The previous prime is 61620617. The next prime is 61620649. The reversal of 61620621 is 12602616.

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

It is not a de Polignac number, because 61620621 - 2² = 61620617 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 61620591 and 61620600.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61670621) 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, 354055 + ... + 354228.

It is an arithmetic number, because the mean of its divisors is an integer number (10624260).

Almost surely, 2^61620621 is an apocalyptic number.

It is an amenable number.

61620621 is a deficient number, since it is larger than the sum of its proper divisors (23373459).

61620621 is a wasteful number, since it uses less digits than its factorization.

61620621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 708315.

The product of its (nonzero) digits is 864, while the sum is 24.

The square root of 61620621 is about 7849.8803175590. The cubic root of 61620621 is about 394.9802286744.

The spelling of 61620621 in words is "sixty-one million, six hundred twenty thousand, six hundred twenty-one".